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[Music]
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up next
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a vibrant successful real estate
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professional is brutally murdered
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this involved the entire range of
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violence even hardened professionals are
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troubled by what they see
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for there to be that much blood left at
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a scene that's what we consider overkill
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police find a possible witness and try
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hypnosis to get
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every detail how many times you see a
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composite sketch and you're like okay
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this looks like just about every human
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being on the face of the planet
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it was a real who done it i hate to do
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it the killer leaves behind a clue
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but would it be enough people will kill
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for the most trivial of reasons
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[Music]
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on a hot summer day a married couple
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decided to look at a sample home
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in the craves ranch housing development
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in mckinney texas
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when they walked into the sample home
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they couldn't find the sales associate
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but they knew right away that something
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was wrong
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and they walked into the living room and
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then they saw a blood trail leading into
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the kitchen
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and that's where they found the sales
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associate
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sarah walker in a pool of blood
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the victim was stabbed 27 times
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there was an incredible struggle
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furniture and plants were knocked over
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it looked like the victim fought for her
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life
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it just didn't happen in a little two by
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four square area
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if you can picture a bar room brawl
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that's probably what was happening
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in that show house there would be that
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much blood left at a scene
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that's what we consider overkill
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sarah walker was 40 years old recently
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divorced
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and the mother of two children i
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answered the phone
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it was the mckinney police department he
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said sarah has been assaulted
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as a result has died of her injuries and
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i just started screaming
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no no no
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sarah worked for a real estate company
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showing model homes to potential buyers
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and was very successful she also
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appeared
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in some sales videos dr horton is so
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proud to be in a neighborhood like this
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it stands out above all the rest
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she was thrilling and she was exciting
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and
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full of energy she would walk into a
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room and
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she would just light up the place she
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had enough energy for
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you know four or five people police
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found
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a bank surveillance video recorded a few
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hours before sarah's murder
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showing her making a deposit
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in the video she was wearing an
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expensive ring
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and watch neither one was found on
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sarah's body
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the watch wasn't at her home when we
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searched her home it wasn't in her car
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it wasn't anywhere in her office
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so we started to think pretty soon that
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whoever had killed her
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had taken that ring in that watch she
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had it on two hours before she died
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that helps us prove that in fact a
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robbery occurred
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police also discovered that the killer
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most likely
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posed as a client she was talking to my
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cousin she said i'm sorry i have to go
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somebody just walked in which means
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there's a customer here
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i'm gonna go sell a house
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just 30 minutes later sarah was dead
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it was hard for investigators to imagine
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a crime of this
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magnitude in an upscale housing
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development
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things just didn't match really it just
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struck me as the last place i would
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expect a crime like this to occur
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we had a real whodunit on our hands if
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it was
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a random attack we were very concerned
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that someone who would kill
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sarah in this manner was somebody who
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would
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probably not hesitate to do this again
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with a killer free no one especially
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mckinney police could sleep easily
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as investigators analyzed the scene of
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sarah walker's murder they quickly
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discovered
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that she was killed in the living room
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after
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a horrific struggle
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it was also clear that the killer was
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injured too
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he turned the deadbolt knob and he
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closed the blinds
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but his hand was already cut so he left
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his blood
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in both of those places and then at some
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point he dragged sarah into the kitchen
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and he tried to clean up because that
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was his blood in the sink
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investigators also found perfectly round
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drops of blood on the floor of the
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kitchen
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near the body that shape is indicative
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of
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blood being dripped straight down from a
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90 degree angle
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straight down the blood evidence
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provided police
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with the killer's dna profile
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at the autopsy the medical examiner
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discovered no sign of sexual assault
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but he did find something extremely
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unusual apparently during the struggle
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the killer bit the victim on the neck
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it almost brought this crime down to the
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level of savagery
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i'm looking at the evidence of one
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animal biting this woman
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because she's some sort of pray for him
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that he's going to take
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and do with what he wants to and it
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really it really was a disgusting
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feeling
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in a search for suspects investigators
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first looked into sarah's personal life
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they discovered that sarah had recently
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been divorced from her second husband
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randy tate there was no love lost
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between the walker family and randy tate
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let's put it that way
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randy tate was the last known person to
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see sarah alive
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sarah dropped their son off at his house
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earlier that morning
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before she went to work bottom line is i
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want him to catch
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whoever did this according to her family
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and friends it was a divorce she did not
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want
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she wasn't happy with it she was hurt by
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it so we knew that there were some tough
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feelings randy tate claimed he had an
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alibi
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that he was playing golf with friends at
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the time of the murder
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he was initially very cooperative but
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then started to become
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hesitant in our mind to cooperate when
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it came to dna and that sort of thing
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and
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it seemed to be very angry but tate did
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provide his dna
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and it did not match the blood dna at
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the crime scene
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next investigators check an internet
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dating site that sarah joined called
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millionairematch.com when sarah got
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divorced
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that was very difficult on her
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self-esteem it was very hard to get back
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into the dating world
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sarah didn't date many men since her
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divorce
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but when your photograph is on an
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internet dating site profile
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there's always the risk of danger think
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about it this way
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if i exchange one email with a random
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stranger
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or if i just write something like no
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thanks i'm not interested
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you have a suspect right there if you
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return 30 or 40 no thank yous in a week
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and trust me women get inundated with
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that many requests
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well you've got 40 suspects
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investigators interviewed all the men
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sarah spoke to from the site each
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provided a dna sample
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and all were eliminated
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by this time several weeks had passed
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and the trail of sarah's killer was
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turning cold
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then unexpectedly nelson via vicenzio
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the husband of another realtor came
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forward
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with some new information he said
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on the morning of sarah's murder his
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wife got a call from a man who
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identified himself as
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chan lee he wanted to see the model home
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located across the street from the home
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where sarah was killed
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she felt a little suspicious about him
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and wondered if he was legitimate
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and she tried to call the hotel he said
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he was at to find out what time he was
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coming
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and he was not in the room that he said
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he was in in fact
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no chan lee was registered at the hotel
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but she still agreed to meet him
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remember when you're in the real estate
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business
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you're in the business of making a
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commission so you're going to
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accept all comers because you want to
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sell that house you want to make that
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commission
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the realtor did take precautions
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my wife asked me if i was going to come
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along and i said yes
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and i did it for my reasons when they
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arrived
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an asian male drove up in a white
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mustang
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he had a t-shirt no sleeves jeans
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sneakers very athletic and i asked him
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excuse me
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sir is your name chan lee and he
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looked up in the sky did not make any
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eye contact with me
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and sort of gave me a vague look saying
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like no
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but he didn't express anything the man
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walked quickly
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to his car and drove away
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while nelson and his wife waited in the
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town home
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they saw sarah walker arrive for work
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across the street
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i yelled at my wife come and check this
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out there's a
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beautiful striking blonde coming out of
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this sports car
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and she's going to the model my wife
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said oh that's sarah and i said oh
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sarah's looking very good she said well
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yeah
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when nelson and his wife realized that
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their appointment was a no-show
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they left and saw the white mustang
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parked next to sarah walker's car
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nelson said they considered stopping by
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to say hello to sarah
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i said well are we going to go visit
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with sarah
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and my wife said no we're hungry so we
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left
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they left at approximately 1pm
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sarah's body was discovered 20 minutes
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later
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if they had walked in prior to
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the defendant killing sarah would he
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would we have three bodies the
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possibility of
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we have visited sarah and found myself
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and ourselves in the middle of it of
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something terrible
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it will always be my mind
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i consider nelson's wife be very lucky i
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think there's a high likelihood that she
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would have been the victim that day had
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she not
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brought her husband along with her to
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that subdivision
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police now had a possible eyewitness
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but would it be enough
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real estate saleswoman sarah walker was
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robbed and
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murdered in the sample home of an
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upscale neighborhood housing development
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her friends and family reacted with
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disbelief
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the family has suffered beyond
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imagination
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i believe she deemed it to be safe she
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she was very very excited about the
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community when she was first placed over
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there
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my fondest memory of sarah she would
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laugh at all of my jokes whether they
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were funny or whether they were stupid
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she would still
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just laugh and so that always made you
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feel good
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in a fortunate turn of events a witness
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came forward
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telling police he might have seen
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sarah's killer
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unfortunately by the time he came
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forward
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several weeks had passed and police
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feared
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he might have forgotten some of the
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man's physical characteristics
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nelson just had such a brief look at
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this person
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i was hopeful but i was was actually
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kind of doubtful that
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that it was going to work so police
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decided to try
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forensic hypnosis before asking nelson
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any questions about the man's
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description
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the purpose of forensic hypnosis is to
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bring out the detailed
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memory from the subconscious nelson was
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sent to richard shang
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a texas ranger and a trained forensic
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hypnotist
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you get them relaxed and then in that
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relaxed state you bring up a date or an
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offense
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and place them back in a position to
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where they were where they might recall
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an incident
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forensic hypnosis has been used by law
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enforcement since the 1800s
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in texas they've reported a 75
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success rate under hypnosis
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the images in your mind the remembrances
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become so much clearer
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that i've got a lot of faith in his
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hypnosis the memory is
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already there in his mind the memory i'm
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not placing a memory in his mind it's
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already there we're just actually going
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back and revisiting
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that day and time the hypnotist wanted
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nelson
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to think of the incident as if he were
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watching a movie
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and then freeze framed the image of the
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man he saw
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at the model home nelson described the
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suspect
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as asian muscular around 27 years old
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five foot seven inches tall with a buzz
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haircut
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after he described each feature he then
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looked through
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a book of photographs to choose the most
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similar everyone if you look closely
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they have different shaped eyes and
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mouths and noses
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and that book gives the witness an
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opportunity to flip through the pages
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and pick out different features that the
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suspect had
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slowly an image emerged of the man
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nelson saw that day i was saying that
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with these facts
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and the sketch will hit jackpot
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the composite drawing kind of brought
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the case back to the front burner again
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because for a while we had nothing the
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sketch was released to the media
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and immediately produced results yet
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another local real estate agent said she
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recognized the man
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she rented a home to him
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and she said once he came to her home
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asking to use her phone
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when she refused to let him inside he
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grew angry
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he's banging on her back door and now
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she's terrified her dog's going crazy
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this guy's now in her backyard banging
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on her back door so then she calls the
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police
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police identified the man as
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twenty-five-year-old kasul chantakaman
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his parents were from laos but he was
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born
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in the u.s a background check indicated
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he drove
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a white mustang worked as a delivery
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truck driver
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and had a history of violence from age
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15 forward he was in jail
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he assaulted a classmate severe enough
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to be sent to
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juvenile detention when he was 15 he was
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out on that offense for several months
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and then stole a car
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after that he robbed and kidnapped two
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elderly women in north carolina
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he was released on parole just six
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months before sarah walker's murder
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he was paroled to texas because his
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sister lived here and his sister was
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willing to help him
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try to get his life back on course when
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he was interrogated by police casual
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denied
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any involvement in sarah walker's murder
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we're trying to find out the truth i
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think you know
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what's true man that you were in the
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house and you washed your hands or you
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went over there and got a drink of water
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casuel's left hand was covered
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with recently healed scars
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as if he'd been in a knife fight the
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scars weren't lined up
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all along the same plane they were kind
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of going every which way
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and police had a secret weapon the bite
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mark
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on sarah's body would it match
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kasul's teeth
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thanks to an eyewitness and forensic
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hypnosis
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investigators now had a suspect in the
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murder of sarah walker
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twenty-five-year-old kasul chanta kaman
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although he denied any involvement
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prosecutors were convinced
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that he was the killer who sewell is a
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psychopath
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and a sociopath and by that i mean that
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no matter where he is
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he's always thinking about himself first
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it's all about him
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what can he get for himself what can he
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do for himself and others
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others are objects to be used for his
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pleasure for his
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needs say your name for me please
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come on since the perpetrator
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bit the victim sarah walker
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investigators took photographs of
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kasul's teeth
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and made dental impressions
00:17:21
the impressions were then compared to
00:17:23
images of the bite mark
00:17:26
what we tried to do is we tried to make
00:17:28
it not match
00:17:29
we tried to rotate the models we tried
00:17:33
to
00:17:34
flip them around we tried to make it not
00:17:38
work and it just kept going right
00:17:41
back to perfect match it was
00:17:45
as positive as i've ever been
00:17:48
about doing a forensic dentistry case
00:17:52
ironically evidence found on kasul's
00:17:54
cell phone indicated
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he had a fascination with biting he'd
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been
00:18:00
fantasizing about this he had a
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photograph on his cell phone
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of him pretending to bite his own dog
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finally
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casuel's dna profile matched the dna of
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the blood
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found on the floor next to sarah's body
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certainly anytime you have dna i can't
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tell you how valuable that is in today's
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environment with jurors
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they appreciate it they accept it and
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since it's specific to one individual
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it's invaluable to us as prosecutors
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prosecutors believe
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casual preyed on female real estate
00:18:33
agents because
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they often worked alone
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on that tragic day in mckinney texas the
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evidence shows
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that casull called his first target
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asking her to meet him at the model home
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but she sensed trouble and brought her
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husband
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which frightened him away excuse me sir
00:18:54
are you chan lee
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but casual didn't give up he saw there
00:19:13
was another model home across the street
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and he saw sarah walker arrive for work
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oh you know what somebody just walked in
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i won't be able to stay on the phone
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prosecutors believe
00:19:27
he went inside and tried to rob sarah
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give me that watch there was a fight
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while trying to subdue her kasul bitter
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then he used his knife and stabbed her
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more than
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20 times and cut himself in the process
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nelson via vicenzio and his wife
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were just outside while the murder
00:20:02
occurred
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had they stopped in to say hello to
00:20:05
sarah
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they too might have been victims
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he would not have stopped he definitely
00:20:14
would have kept going
00:20:15
a beautiful successful woman her life
00:20:19
tragically cut short sarah's family
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still tries to cope with the loss
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although she's not here with us now
00:20:28
she is in a place that we all dream of
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that we all hear of
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and i believe that she's probably doing
00:20:34
the same thing
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up there as she did while she was here
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which is helping people find their home
00:20:45
in october of 2006 casull was convicted
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of capital murder and sentenced to death
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people will kill for the most trivial of
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reasons
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reasons that no that no rational person
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would ever imagine
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what the science did in this case is it
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made that defense attorney get up in his
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opening statement and say
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my client is guilty and this was a
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robbery combat he would not have said
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that if we hadn't had the physical
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evidence that we had in this case
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this case turned out to be the perfect
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marriage
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of good police work
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excellent science and prosecutorial
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expertise
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it was the perfect blend of all three of
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those things coming together
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to where we got this case from the day
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sarah was murdered
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until he was convicted and sentenced
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you
