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If you mean Arthur Shawcross, serial killer from New York state, then his defense brought up a couple of reasons that could have caused this man to kill. The first is the XYY factor. Linked to aggression but not always murder, the extra chromosome occures every one in a thousand people.

It was also presented at Shawcross's trial that his history of brain trauma caused a personality change and had restricted his ability for self-control. Dr. Helen Morrison testified that a large number of serial killers have suffered head injuries that effect the frontal lobe in the brain. The fact that he may have suffered mental trauma from his time in Viet Nam was also brought up. Whether any one of these or all of them together caused Shawcross's violence remains to be seen.

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