.A serial killer is a person who murders three or more people[1][2] over a period of more than 30 days, with a "cooling off" period between each murder, and whose motivation for killing is largely based on psychological gratification.[3][4] Often, a sexual element is involved with the killings. The murders may have been attempted or completed in a similar fashion and the victims may have had something in common, for example occupation, race, appearance, gender, or age group.
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