Despite a growing body of research on the association between psychosis and homicide and between psychosis and sexual offending, research on psychosis and sexual homicide is limited. The objective of this review was to estimate the prevalence of psychosis in sexual homicide and to explore the extent to which prior research has investigated symptoms of psychosis as a motivating or causal variable leading to incidents of sexual homicide. We hypothesized that psychosis is present in a minority of sexual homicide cases. Articles were identified by searching literature databases (i.e., PsycINFO, MEDLINE, EMBASE) and references of relevant articles. Eight studies were included. The overall prevalence of psychosis among individuals who committed sexual homicide ranged from 0 to 27 percent as measured in a broad array of diverse samples. Given that five of the eight studies reported psychosis rates to be five percent or less, our findings suggest that psychosis occurs in a minority of sexual homicide cases. None of the studies directly examined the causal or motivational properties of psychosis in driving these types of offenses, and this represents an important area of inquiry for future research.

中文翻译：

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性杀人精神病患病率回顾。

尽管关于精神病和杀人之间以及精神病和性犯罪之间联系的研究越来越多，但是关于精神病和性杀人的研究仍然有限。这篇综述的目的是评估性杀人中精神病的患病率，并探讨先前的研究对精神病症状作为导致性杀人事件的动机或因果变量进行调查的程度。我们假设少数性杀人案中存在精神病。通过搜索文献数据库（即PsycINFO，MEDLINE，EMBASE）和相关文章的参考文献来识别文章。包括八项研究。在广泛的不同样本中测得，实施性杀人罪的人中精神病的总体患病率为0％至27％。鉴于八项研究中有五项报告的精神病发生率在5％或以下，我们的发现表明，精神病发生在少数性杀人案件中。没有一项研究直接检查精神病在推动这些类型的犯罪中的因果关系或动机特性，这代表了未来研究的重要领域。