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  2. Disorganized offender - Wikipedia

    en.wikipedia.org/wiki/Disorganized_offender

    In criminology, a disorganized offender is a type of serial killer classified by unorganized and spontaneous acts of violence. The distinction between "organized" and "disorganized" offenders was drawn by the American criminologist John Douglas and Roy Hazelwood . [ 1 ]

  3. FBI method of profiling - Wikipedia

    en.wikipedia.org/wiki/FBI_method_of_profiling

    One of the first American profilers was FBI agent John E. Douglas, who was also instrumental in developing the behavioral science method of law enforcement. [3]The ancestor of modern profiling, R. Ressler (FBI), considered profiling as a process of identifying all the psychological characteristics of an individual, forming a general description of the personality, based on the analysis of the ...

  4. Serial killer - Wikipedia

    en.wikipedia.org/wiki/Serial_killer

    Disorganized serial killers have been found to have a lower mean IQ than organized serial killers, at 89.4. Mixed serial killers, with both organized and disorganized traits, have an average IQ of 100.9, but a low sample size.

  5. Offender profiling - Wikipedia

    en.wikipedia.org/wiki/Offender_profiling

    Investigations of serial killers Ted Bundy and Gary Ridgway were performed in 1984 by Robert Keppel and psychologist Richard Walter. They went on to develop the four subtypes of violent crime and the Hunter Integrated Telemetry System (HITS) database which compiled characteristics of violent crime for research. [25]

  6. Macdonald triad - Wikipedia

    en.wikipedia.org/wiki/Macdonald_triad

    The Macdonald triad (also known as the triad of sociopathy or the homicidal triad) is a set of three factors, the presence of any two of which are considered to be predictive of, or associated with, violent tendencies, particularly with relation to serial offenses.

  7. The Most Notorious Serial Killer from Each State - AOL

    www.aol.com/most-notorious-serial-killer-state...

    However, "The Zodiac Killer" remains one of America's most infamous and elusive serial killers. Active in the late 1960s and early 1970s, he is confirmed to have killed at least five people in ...

  8. John E. Douglas - Wikipedia

    en.wikipedia.org/wiki/John_E._Douglas

    John Edward Douglas (born June 18, 1945) [1] [2] [3] is an American retired special agent and unit chief in the United States Federal Bureau of Investigation (FBI).. He was one of the first criminal profilers and has written and co-written books on criminal psychology, true crime novels, and his biography.

  9. Serial killer Gary Ridgway terrorized the Pacific Northwest in the 1980s and '90s. He was ultimately caught in 2003 and pleaded guilty to nearly 50 counts of murder . Interestingly, Ridgway had ...