Circumstances of Connected Homicides: An Analysis of the Chicago Homicide Data Set, 1965 to 2000.

From 1965 through 2000, 27,345 homicide victims were officially recorded in Chicago. Of these victims, 1,807 were killed in the same incident as at least one other homicide victim, and 675 were killed in a homicide that was otherwise connected to at least one other homicide. These otherwise connected homicides include the following types: serial (the offender was also the offender in another homicide), the offender became the victim in a later homicide, the victim had been a witness to a previous homicide, spree (multiple but separate homicides in a short period), victim and offender killed each other in the same incident, and retaliation for a previous murder where neither victim nor offender was involved in that murder (e.g.: drive-by shooting, killing of a family member, random gang shooting).This presentation, the first report of the newly updated Chicago Homicide Dataset (available from ICPSR), looks at the relationship between homicide syndrome and connected homicides. How do incidents with multiple victims differ from incidents otherwise connected, and from all other incidents? For example, while victims of multiple killings are no more likely to be killed in gang motivated incidents (13%) than single victim killings (12%), gang motivation is a causative factor for 34% of the otherwise connected murders. ..PAT.-Unpublished Manuscript [ABSTRACT FROM AUTHOR]