A serial killer or serial murderers are traditionally defined as a person who has murdered three or more people, over a period of more than a month, with a cooling period between.
A serial killer is commonly a person who murders three or more persons, with the murders occur over more than a month and including a significant period of time between them. Most authorities set a threshold of three murders, while others extend it into four or lessen it into two.
For a serial killer, the murders have to be separate events, that are most often driven by a psychological thrill or pleasure. And serial killers generally have a type of victim that they seek out.
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