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personally I could sort of relate to Kathy Blair and just thinking about what that would be like as a woman to be home
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alone that is the boogieman story every woman's powerful and intruders in your house someone is stabbing you
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[Music] this is a case that sticks with you throughout your life my name is Derek
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Israel I was working in the Homicide Unit when this case occurred my name is Carrie Scanlon and I was the lead
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investigator on Cathy Blair murder Cathy was a larger than life she's my big sister I have always
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thought everything Kathy did was amazing how would you describe her from a student's perspective she was so kind
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just believed in me wholeheartedly it still makes no sense who kills a choir director who does that monster I get
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notified that there's been another murder the victims are an elderly couple they were the best parents who could
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care for all they were just sweet people like anybody's grandmother and grandfather right from the get-go he
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started sounding really familiar it's so violent and it's eerily similar Kathy Blair's and when we saw the connection
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we just continued to work the investigations Carrie and I both kind of came to the conclusion that there was a
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serial killer working here in Austin I was out testing a thermal scope I needed to get some videos from dear Rob
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leaf has this thermal-imaging scope it's a night vision riflescope so I saw the car pull up in park I
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assumed in with the scope and by the time I assumed in someone had gotten out walked over the sidewalk that is just
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unbelievably chilly last thing they were expecting was high-resolution thermal video this video showed the murderer
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walking towards Kathy Blair's house the actual killer the actual killer you [Music]