One theory about why some people become serial killers is that damage to the brain may be a contributing factor. It's long been understood that injury to certain parts of the brain, including the limbic system, frontal lobe and hypothalamus, can lead to impaired judgment, aggression and even violence. The brains of convicted serial killers have been studied over the years and in some case they've revealed that damage had been sustained as a result of malnutrition, abuse or alcoholism. The brain of a serial killer named Arthur Shawcross revealed multiple injuries, including skull fractures.
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