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Gein had an oedipal complex
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which developed in the years he nursed his paralyzed mother
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back from a stroke.
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After she died, his obsession compelled him
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to dig up corpses of women who resembled his mother.
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So persistent was his desire to resurrect his dead mother
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that he actually dressed in female suits fashioned from human skin.
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Eventually, Gein grew unhappy with the flesh of dead bodies,
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which had a tendency to dry and crack,
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so he shifted his focus to live victims
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whose bodies he could better preserve.
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The evolution from dead to live victims