The missionary murders because he believes that he is meant to get rid of a particular group of people. The visionary murders because he hears voices or has visions that direct him to do so. Within this group, there are two different types: the visionary and the missionary. For act-focused killers, killing is simply about the act itself. According to Holmes typology, serial killers can be act-focused (who kill quickly), or process-focused (who kill slowly). Critics of the Holmes typology point to this as a flaw, but many investigators still find the method useful when studying serial murder. Serial killers are also more likely to have experienced some type of child abuse or trauma. There is not enough scientific data upon which to base these classifications, either - they are based on anecdotal and interview data. You may be asking yourself, what makes a serial killer. Neither of these classifications explain what might actually lead someone to become a serial killer (more on this later). Not every serial killer falls into a single type, and many are more than one type. Intense study in the field of serial murder has resulted in two ways of classifying serial killers: one based on motive and one based on organizational and social patterns. Holmes, authors of numerous textbooks on serial murder and violent crime. In 1991, Barrett combined Holmes and De Burger’s typology and the FBI’s system for classifying serial rapists to form a new classification (Rossmo, 1987). The motive method is called Holmes typology, for Ronald M. Rappaport’s typology describes serial killers into four typessexual sadists, delusional killers, custodial killers, and utilitarian killers.
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