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Individuals who have been convicted of committing multiple murders over a period of time, typically with a cooling-off period in between each crime. These individuals often display a pattern of behavior and specific characteristics, such as a lack of remorse or empathy for their victims, a need for power and control, and a desire to inflict harm on others. Serial killers may have a specific method or motive for their crimes, and they often carefully plan out their attacks in order to avoid detection. The psychology and motivations behind serial killers have been the subject of much study and debate within the field of criminology and psychology.