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The field of sexual homicide research is relatively recent, with many existing studies limited by small sample sizes and sampling bias. In Australia and New Zealand specifically, only one study to date addresses this phenomenon but there is a lack of comprehensive descriptive data. This study aims to fill this research gap using a representative sample gathered from public legal databases. A total of 118 cases of sexual homicide offenders are described to create a portrait of this type of offender, their victims and their offence behaviour. Findings are similar to those found in other large samples from the UK, Canada and Germany. Because this crime is rare and practitioners tend to have limited experience of them, the findings of this research have the potential to inform investigative, criminal justice and clinical practice. [ABSTRACT FROM AUTHOR]

There is a dearth of research on multiple perpetrator sexual homicide. This is an exploratory and descriptive study of the phenomenon in Australia and New Zealand over the last five decades. Cases where sexual homicides were committed by two or more offenders were identified from a legal database. Legal reports and media sources were used to generate case vignettes describing groups, victims, offenders and offences. Summary descriptive data is presented, and the roles of leadership, group composition and sexual sadism are examined. There were 23 groups of 62 offenders, who killed 50 victims. Fifteen groups were pairs and eight were three or more. There were some similarities to single perpetrator cases in the literature, but female perpetrators, male victims, multiple victims, ability to form relationships and sadistic behaviour were over-represented. Most groups had a dominant leader. Leadership and group effects are key factors in most multiple perpetrator sexual homicides. Current models and typologies of sexual homicide need to be adapted to apply to this phenomenon. Sadistic behaviour in such cases is partly due to sexually sadistic leaders but partly due to the amplifying effect of group dynamics. • There has been very little research on multiple perpetrator sexual homicide. • These crimes in Australia and New Zealand over 50 years were complex and diverse. • Most involved a dominant leader, and few were equal partnerships. • Sadistic behaviour was common, due to both sexually sadistic leaders and group amplifying effects. • Current theoretical models require adaptation to apply to sexual homicides committed by groups. [ABSTRACT FROM AUTHOR]

Sexual homicides (SHs) demand nuanced research for effective prevention, treatment, risk assessment and theoretical insights. Intimate-partner sexual homicides (IPSHs), comprising approximately 20% of SHs, have received limited attention. This study compares IPSHs (n = 56) and non-intimate partner sexual homicides (NIPSHs) (n = 236) in Australia and New Zealand by investigating offender, victim, and crime-scene characteristics. While IPSH perpetrators were typically older, separated, and had prior domestic violence convictions, victims were more often non-white with histories of domestic violence and substance use. Although crime-scene locations and post-offence behaviours differed, similar crime scene behaviours were displayed across offender groups, which seemed to be routed in different underlying motives. Whereas drivers of IPSH commonly were grievance and anger, associated with offences occurring after arguments, drivers for NIPSH were more often sexual deviance and sadism. Overall, IPSH encompasses aspects of domestic violence, homicide, and sexual violence, distinguishing it from SH., (© 2024 The Author(s). Behavioral Sciences & The Law published by John Wiley & Sons Ltd.)

The present study examined distinctions between child (n = 30) and adult (n = 212) sexual homicide offenders (SHOs) in Australia and New Zealand, contributing to the limited international research on the subject. Data, primarily sourced from judges' sentencing comments on AustLII and New Zealand Legal Information Institute, revealed significant differences. Child SHOs displayed elevated rates of pedophilia, sexual deviance, and adverse childhood experiences, including sexual abuse. They were more likely to be married, cohabitate, and target familial victims. Their crimes were more often committed during daylight and outdoors, involving tactics such as victim conning, restraints, strangulation, and hiding victim's bodies. No significant group differences emerged regarding offenders' psychopathy or sexual sadism scores. Results were interpreted in line with child SHOs' deviant sexual preferences and the routine activity theory. The study, as the first investigating child sexual homicides in Australia and New Zealand, sets the foundation for an evidence-based approach to policy and practice., (© 2024 The Author(s). Behavioral Sciences & The Law published by John Wiley & Sons Ltd.)