Murder

This chapter examines murder not merely as isolated incidents but as a phenomenon in which patterns of behavior, location, and motive can be systematically analyzed to link cases and inform investigations. It distinguishes between serial, spree, and mass murder, clarifying the temporal and spatial dimensions that separate these classifications. Building on variables such as victim selection, planning and timing, weapon choice, method of killing, signature behaviors, and post-crime actions, the chapter outlines how investigators identify recurring elements that reveal offender modus operandi (MO) and potential forensic “signatures.” Attention is given to geographic and situational patterns, including murder within gang territories, contract killings, and other group-based homicides, as well as the rarity and myths surrounding serial murder. Drawing on major studies and law enforcement resources, the chapter underscores that while forensic evidence is the most reliable linkage tool, the analysis of behavioral variables – when combined with inter-agency cooperation and data systems like the FBI’s ViCAP – enables investigators to recognize serial behavior, forecast offender activity, and allocate resources strategically.