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Serial murder is the unlawful killing of at least two people by the same person or persons in separate events. This is distinct from mass murder, where multiple victims are killed simultaneously in one location. The term "serial murder" was popularized in the 1970s, and while definitions vary, a common understanding involves at least two murders occurring over a period of time.1

Classic serial murder is often sexually motivated and involves stalking. Unlike political assassinations or contract killings, serial murders typically lack an obvious rational motive, with killers often acting for personal gratification, such as a feeling of power. Victims are frequently those perceived as vulnerable. Serial murder has a long history, with documented cases dating back to ancient Rome, and its incidence has been noted to increase with advancements in law enforcement and media coverage.1

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