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Ted Bundy, John Wayne Gacy,
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even the imaginary Hannibal Lecter.
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Many of these sort of serial killers do have some sort of mental illness
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but the mental illnesses are all over the place.
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There was a guy, Jerome Brudos,
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who had such a severe fetish for women's feet
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that he killed young women and severed their feet
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and then kept their feet around his house.
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Son of Sam was pretty clearly a paranoid schizophrenic.
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He did his murders because a barking dog told him to.
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Jeffrey Dahmer is a cannibal killer
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and he killed people so he could eat them and then--