Serial Homicide: An Investigation of Behavioural Consistency

C. Gabrielle Salfati and Alicia L. Bateman

Abstract

The current study, using 23 cases of US serial murder, sought to develop a model of serial homicide offending behaviour that effectively distinguishes between groups of serial homicide offenders based on the aggressive theme (instrumental or expressive) the offenders employ during their series of homicides. The model of serial homicide offending behaviour was further tested to examine if offenders are consistent in the aggressive theme performed across the first three offences in their series and if inferences can reliably be made regarding the likely characteristics of the offenders. The applicability of the instrumental/expressive model of serial homicide offending behaviour for investigations is discussed and suggestions for improving empirical knowledge about serial homicide offending behaviour is made.