Three-year-old Vanessa Bennett becomes the lone survivor of her family’s brutal massacre in early 1984. Investigators at the time suspect that a serial killer is at large, but decades later the suspect pool narrows down to just one man.

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The dogged work of an Alberta, Canada, detective finally pays off when he tracks down the man who raped and murdered a 6-year-old girl 10 years earlier. And when police search for the killer of an 18-year-old hitchhiker, they find that the victim's diary is one of their best clues.

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Survivor Morgan Rowan describes for the first time on television how she was brutally attacked in 1968 by social gadfly Rodney Alcala, during a party at his Hollywood home. Just three weeks later, Alcala would abduct and attack 8-year-old Tali Shapiro, who describes her chilling assault in her own words. Morgan and Tali were the only survivors of soon to be serial killer Rodney Alcala, who was convicted of five Southern California murders in the 1970's. Alcala was so wickedly brazen that he actually appeared on an episode of "The Dating Game" during his murderous reign of terror.

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