What is the terminology for someone who is aroused by strangling someone to death?
Albert DeSilva, the Boston Strangler, was a(n) ________.
I realize sadist covers this but I was hoping for a more specific term.
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What you describe is one type of paraphilia.
_ "Albert DeSilva, the Boston Strangler, was a paraphilic individual or suffered from a paraphilic disorder."
Paraphilia (previously known as sexual perversion and sexual deviation) is the experience of intense sexual arousal to atypical objects, situations, fantasies, behaviors, or individuals.
No consensus has been found for any precise border between unusual sexual interests and paraphilic ones. There is debate over which, if any, of the paraphilias should be listed in diagnostic manuals, such as the Diagnostic and Statistical Manual of Mental Disorders (DSM) or the International Classification of Diseases (ICD). The number and taxonomy of paraphilia is under debate; one source lists as many as 549 types of paraphilia.
Albert DeSilva, the Boston Strangler, was a lust murderer.
From a psychologytoday.com blog:
Erotophonophilia is a sexual paraphilia in which individuals derive sexual pleasure and arousal from murdering (or imagining they are murdering) someone. Many academics in the forensic field refer to such killings as ‘lust murder’.
From another psychologytoday.com blog:
They didn’t invent “lust murderer” as a category. That’s been in criminology circles for well over a century. But they did add behavioral nuances that they hoped would assist investigators.
Also http://www.practicalhomicide.com/articles/lustmurder.htm which is so horrible I'd rather not quote from it.