The Killer Next Door

Serial killer Edmund Kemper had Santa Cruz, Calif., on edge in the early 1970s; profiler John Douglas delves into the killer's tormented past in search of what drove the so-called Co-Ed Killer to snatch, murder and dismember young women.

In the summer of 1985, a serial killer started phoning the family of one of his victims; John Douglas used the recorded phone calls to reveal what drove Larry Gene Bell to taunt this family, and how this helped ensure Bell was convicted.

John Douglas reveals secret clues about the man behind the House of Horrors; Gary Heidnik lured several women into his basement where he held them prisoner, tortured them and murdered two.

John Wayne Gacy lived a double life as a respected civic leader and the murderer of at least 33 men; John Douglas uses FBI interview tapes to decode how and why Gacy got away with it for so long.

David Berkowitz, aka the Son of Sam, terrorized New York in the 1970s when he killed six people and wounded others, all as rumors of ties to a satanic cult emerged; John Douglas sat down with Berkowitz to separate fact from fiction.