Les caractéristiques individuelles, de l'événement criminel et de l'enquête criminelle en matière d'homicides sexuels sériels et non-sériels
Over the last three decades, many theoretical models of sexual homicide have been proposed, which have made it possible to propose a profile of individuals. Although these models and profiles have suggested associations between the commission of one or more sexual homicides and a wide variety of factors—notably developmental, psychological, and crime-phase—none has produced a unified vision of sexual homicide that takes into account all factors. Moreover, these models and profiles, with the exception of that of the US Federal Bureau of Investigation, have been based on samples of individuals having committed a single homicide. As a result, although they propose explanations of the emergence of sexual homicide, current models and profiles are silent on the determinants of its repetition and cessation. Additionally, these models and profiles do not address post-homicide parameters, such as those related to the criminal investigation, since they do not take into account the sexual murderer’s life course following the commission of the homicide. For all these reasons, considerable uncertainty remains about why some individuals commit a series of sexual homicides while others commit only one. The principal objective of this thesis’s research was therefore to identify the distinctive characteristics of individuals having committed a series of sexual homicides, in order to proposed profiled of serial and nonserial sexual murderers. To this end, comparative analyses of serial sexual murderers (HSSs; n = 33) and nonserial sexual murderers (HSs n = 87) were conducted. The results indicate that the two groups of participants in this sample can be distinguished not only on individual factors and the manner in which the homicide was committed, but also on the failure of criminal investigators to apply best practices and rapidly resolve the homicides. Finally, this thesis’ research establishes a foundation for the development of theoretical models of serial and nonserial sexual homicide that explain the circumstances responsible for the emergence, repetition, and cessation of this phenomenon.
Modus operandi Sexual homicide Seriality Adverse childhood experience Daily life Modus operandi Criminal investigation