Serial killer

A serial killer is typically a person who murders three or more persons, with the murders taking place over more than a month and including a significant period of time between them. While most authorities set a threshold of three murders, others extend it to four or lessen it to two. Psychological gratification is the usual motive for serial killing, and many serial murders involve sexual contact with the victim. The Federal Bureau of Investigation (FBI) states that the motives of serial killers can include anger, thrill-seeking, financial gain, and attention seeking, and killings may be executed as such. The victims may have something in common; for example, , appearance, gender or race. Often the FBI will focus on a particular pattern serial killers follow. Based on this pattern, this will give key clues into finding the killer along with their motives. Although a serial killer is a distinct classification that differs from that of a mass murderer, spree killer, or contract killer, there exist conceptual overlaps between them. Some debate exists on the specific criteria for each category, especially with regard to the distinction between spree killers and serial killers. The English term and concept of serial killer are commonly attributed to former FBI Special agent Robert Ressler, who used the term serial homicide in 1974 in a lecture at Police Staff Academy in Bramshill, Hampshire, England, United Kingdom. Author Ann Rule postulates in her 2004 book Kiss Me, Kill Me, that the English-language credit for coining the term goes to LAPD detective Pierce Brooks, who created the Violent Criminal Apprehension Program (ViCAP) system in 1985. The German term and concept were coined by criminologist Ernst Gennat, who described Peter Kürten as a Serienmörder ('serial-murderer') in his article "Die Düsseldorfer Sexualverbrechen" (1930). In his book, Serial Killers: The Method and Madness of Monsters (2004), criminal justice historian Peter Vronsky notes that while Ressler might have coined the English term "serial homicide" within the law in 1974, the terms serial murder and serial murderer appear in John Brophy's book The Meaning of Murder (1966).