We have collected a database of 359 cases of spree killing involving 419 individuals from 43 countries in order to group them by type and to identify through motives and circumstances those cases for which law enforcement can develop an effective action plan. Within the scope of this approach, we group these offenders into five primary categories (Anger/Revenge, Mission, Desperation, Mental Illness, and Robbery/Thrill) and four secondary categories (Movement in Tight Locations, Mixed Multicides, Intended Spree, and Unique Circumstances), although we did not include the latter two in our calculations. The statistical analysis covered seven categories in total. Three primary and two secondary categories yielded further division into subcategories. We call each inclusion in a category a case rather than an incident, because each spree covers two or more incidents. Some cases feature a lone offender, while others involve teams. In a few cases, some team members did not participate in all of the killings (and occasionally a team member became a victim).