
This episode covers the Zodiac Killer's letters sent to newspapers in 1969, the cryptogram, and the Lake Berryessa attack. The episode discusses the details of the letters, the cipher, and the killer's evolving methods.
The Zodiac Killer sent three letters to the Vallejo Times Herald, San Francisco Chronicle, and San Francisco Examiner on August 1, 1969, claiming responsibility for the murders of two teenagers. Each letter contained a portion of a cryptogram, demanding publication on the front page.
Listeners learn about the cryptogram's complexity and its eventual solution by Donald and Betty Hardin. The cipher revealed the killer's enjoyment of murder and his belief in an afterlife where his victims would serve him.
The episode details the Lake Berryessa attack on September 27, 1969, where the Zodiac Killer, disguised in a hood, attacked Brian Hartnell and Cecilia Shepard. The killer's method shifted from shooting to stabbing, indicating an evolution in his approach to murder.
Finally, the episode discusses the killer's taunting phone call to police after the attack, further showcasing his desire for recognition and the psychological games he played with law enforcement.
The episode details the Zodiac Killer's letters, cryptogram, and the Lake Berryessa attack, highlighting his evolving methods and desire for recognition.

This episode stands out for the following:
This is the murderer of the two teenagers last Christmas.The Zodiac /// Part 2 /// 471
I like killing people because it is so much fun.The Zodiac /// Part 2 /// 471
He's described as possibly 225 to 250 pounds, so a big boy, stocky and built.The Zodiac /// Part 2 /// 471
This guy is playing a game and not informing us of the rules.The Zodiac /// Part 2 /// 471
This Deer Lodge Montana is more truth than fiction.The Zodiac /// Part 2 /// 471
He knows the shock value of that is going to be supreme.The Zodiac /// Part 2 /// 471