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Mass murderers kill many people, typically at the same time in a single location. With some exceptions, many mass murders end with the death of the perpetrators, either by self-infliction or by law enforcement.
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A serial killer is conventionally defined as a person who murders three or more people in a period of over a month, with “cooling down” time between murders. For a serial killer, the murders must be separate events, which are most often driven by a psychological thrill or pleasure. Serial killers often lack empathy and guilt, and most often become egocentric individuals; these characteristics classify certain serial killers as psychopaths.
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