Purpose

The anger/sadistic model is one of several typologies proposed for sexual homicide events. This paper aims to empirically test this model by examining sexual homicide cases. Empirically validating these typologies provides greater validity and reliability toward the sexual homicide classification systems that are useful in police investigations.

Design/methodology/approach

Secondary data analysis was conducted using police data on 249 solved sexual homicide cases in Canada from 1948 to 2010. Through a robust classifying method, latent class analysis was used to examine variables from the anger/sadistic typology. Additionally, variables from the pre-crime, crime and post-crime phases were examined in relation to the classes’ external validity.

Findings

Three classes emerged, namely, expressive, methodical and instrumental. Expressive and methodical were similar to the anger/sadistic model in terms of the presence of premeditation, victim-offender relationship and body disposal location. Instrumental was characterized by the absence of mutilation on the victim’s body, targeted acquaintances and the use of physical restraints. The three-class typology resembled evidence found in a previous systematic review and also reinforced the notion of heterogeneity in sexual homicide offenses.

Originality/value

This is the first study to empirically test the anger/sadistic typology. Such validation is important given that sexual homicide classification systems can aid in police investigations (e.g. narrowing down the list of potential suspects). Replication of studies is needed to lend credibility to research processes, which, in turn, allows practitioners and policymakers to integrate the results into policies effectively.

中文翻译：

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重新审视性凶杀的愤怒/虐待狂类型

目的

愤怒/虐待狂模型是为性凶杀事件提出的几种类型之一。本文旨在通过检查性凶杀案来实证检验该模型。对这些类型进行实证验证可以为在警察调查中有用的性凶杀分类系统提供更大的有效性和可靠性。

设计/方法/方法

二级数据分析是使用加拿大 1948 年至 2010 年已解决的 249 起性凶杀案的警方数据进行的。通过强大的分类方法，潜在类别分析用于检查愤怒/虐待狂类型学中的变量。此外，还检查了犯罪前、犯罪后和犯罪后阶段的变量与类的外部有效性的关系。

发现

出现了三个班级，即表现型、方法型和工具型。表现力和有条不紊在预谋的存在、受害者-犯罪者关系和尸体处理地点方面类似于愤怒/虐待狂模型。Instrumental 的特点是没有残害受害者的身体、有针对性的熟人和使用身体约束。三类类型类似于之前系统评价中发现的证据，也强化了性杀人犯罪的异质性概念。

原创性/价值

这是第一项对愤怒/虐待狂类型进行实证测试的研究。鉴于性凶杀分类系统可以帮助警方调查（例如缩小潜在嫌疑人名单），这种验证很重要。需要重复研究以提高研究过程的可信度，这反过来又使从业者和政策制定者能够将结果有效地纳入政策。