| http://www.w3.org/ns/prov#value | - A serial killer is a person who murders three or more people[1][2] for psychological gratification, with the murders totaling more than a month's time and including a significant break (a cooling off period) between each of them.[3][4] Some sources, such as the FBI, disregard the three or more criterion and define the term as a series of two or more murders, committed as separate events, usua
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