A theoretical distinction between instrumental and expressive aggression was used in analyzing offender characteristics and their associations with crime scene actions in Finnish homicides. Twenty-one variables reflecting the offenders' criminal activity, previous relationships with intimates and victims, and general social and psychological adjustment were derived from files of single-offender/single-victim homicides occurring between 1980 and 1994 (n = 502). Additionally, three variables describing post-offense actions and police interview behavior were included. A multidimensional scaling procedure was used to investigate the interrelationships between the variables. A distinction between expressive and instrumental characteristics was observable in the empirical structure, which was divided into three subthemes of Instrumental, Expressive: Blood, and Expressive: Intimate. Associations between the characteristics with five previously identified subthemes of crime scene actions were computed. In addition, the subthemes of crime scene actions were related to post-offense actions and police interview behavior, with Expressive themes being associated with less denial as well as a greater likelihood of surrendering and confession. The practical usefulness for police investigations and theoretical implications of the results are discussed.
The structure of crime-scene actions in Finnish homicides was analyzed using the theoretical distinction between instrumental and expressive aggression. Thirty-eight crime-scene actions were derived from the files of single-offender, single-victim Finnish homicides (N = 502). A multidimensional scaling procedure was used to investigate their structure. An expressive core indicating an emotional and impulsive attack without any indication of planning or post-mortem dealing with the body was found. Over 40% of the cases had no additional variables present. A distinction between expressive and instrumental types of aggression was observable in the rest of the crime-scene actions. The instrumental actions were further divided into subthemes indicating either a sexual or a resource-acquirement theme. Likewise, the expressive actions were divided into three subthemes, where the main emphasis had to do with the use of firearms, hiding and moving the body, and removing parts of the body.
The crime scene actions employed by offenders in stranger rapes were analysed in relation to offender characteristics. Data were drawn from an official police database and consisted of stranger rapes occurring in Finland between 1992 and 2001 (n = 100)
. The structure of dichotomous variables derived through a content analysis of crime scene actions and offender characteristics were analysed with non-metric multidimensional scaling (MDS
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