Notorious serial killers are individuals responsible for two or more murders committed in separate events over a period of time. These crimes are typically driven by internal psychological motivations such as control, compulsion, fantasy, or a need for dominance, rather than immediate situational conflict.
Lesser-known serial killers are offenders whose crimes received limited national or sustained media attention yet remain significant within criminal history and behavioral analysis. These cases often provide important insight into patterns of escalation, offender psychology, and investigative methodology.

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