In September of 1970, a 25-year-old nurse finished up a late-night shift at a casino near Lake Tahoe and seemingly vanished without a trace. What followed was a series of mysterious phone calls and letters, which would eventually connect her to one of the most prolific serial killers in modern history. But is he truly behind her vanishing? This is the murder of Donna Lass: The 12th Zodiac Victim?

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In October of 2013, a 24-year-old math teacher stayed behind after classes at her Massachusetts high school to offer assistance to one of her students. But when she didn’t come home that night, police descended on the school, discovering disturbing surveillance footage and a truly horrifying scene left behind in the woods nearby. This is the murder of Colleen Ritzer.

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On Halloween Night, 1985, a Texas girl vanished following what should have been a fun evening of trick or treating. When her body was found nearby, police began an exhaustive search for her killer. Then suddenly, a string of handwritten letters began to come in to the local sheriff’s office, which included riddles that police were challenged to crack if they wanted to unmask a killer… This is the murder of Mary Stiles, and the story of The Baytown Riddler.

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