Kemper on Kemper: Inside The Mind of a Serial Killer

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Why do some killers like Ed Kemper go beyond murder and mutilate corpses? "The answer is, the killing alone is not psychosexually sufficient," said a forensic psychology professor.

Ed Kemper, also known as the Co-Ed Killer, murdered and dismembered 10 people, including his own mother. Former FBI agent John Douglas takes us through his extensive interviews with Kemper, which became the backbone of modern criminal psychology.

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 Dubbed “friendly” and “cooperative” by law enforcement, Kemper divulged every detail of his crimes to law enforcement.

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But Harold Cartwright said he "never felt unsafe" in Kemper's presence.

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"I was getting less detectable," said Ed Kemper.

Ed Kemper, also known as the Co-Ed Killer, murdered and dismembered 10 people, including his own mother. Former FBI agent John Douglas takes us through his extensive interviews with Kemper, which became the backbone of modern criminal psychology.

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"I came from my mother, and in a rage, I went right back in," said Kemper.

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Listen to serial killer Ed Kemper explain why he murdered his own mother and "humiliated" her corpse.

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Harold Cartwright recounts defending serial killer Ed Kemper.

At an early age, serial killer Ed Kemper displayed disturbing behavior. Experts discuss Kemper’s obsession with death and the morbid role-play games he played with his sisters.

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Experts explain the twisted motivations behind "Co-Ed Killer" Ed Kemper's gruesome murders.

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Profilers realized they could use their strategies from interviewing Kemper to figure out how other serial killers tick.