Dr. Ramsland shares an exclusive interview with Elmer Wayne Henley, studying his journey from groomed teen to killer in the 1973 Houston Mass Murders.

In the bucolic town of Delphi, Indiana, Abigail Williams and Liberty German set out for a walk on and never came home. Setting off a five-year-long search that gripped the nation and haunted this close-knit community.

Mike Williams vanishes during a duck hunting trip in northern Florida. Initially presumed eaten by alligators, suspicions arise when his widow Denise marries his best friend Brian. Friend Kathy investigates to uncover what really happened.

In 1984, Ted Bundy offers to help catch the Green River Killer--launching a chilling game of cat and mouse with detective Robert Keppel. Featuring never-before-heard tapes, this is a gripping descent into one of history's darkest minds.

After the arrest of the alleged Gilgo Beach serial killer, this 3-part series goes inside the suspect's home for the first time, where never-before-heard testimony from his own family unravels a chilling portrait of a man accused of living a double life and hiding dark secrets under their own roof. Written by producer

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Mixing present-day interviews with previously unheard recordings, this true-crime series examines serial killer David Berkowitz's mark on 1970s New York.

It explores 1980s Chicago deaths from cyanide-laced Tylenol capsules. The case led to tamper-proof packaging and became one of America's largest criminal investigations.