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James Carothers Garrison (born Earling Carothers Garrison; November 20, 1921 – October 21, 1992) was the District Attorney of Orleans Parish, Louisiana, from 1962 to 1973 and later a state appellate court judge. A member of the Democratic Party, he is best known for his investigations into the assassination of John F. Kennedy and the prosecution of New Orleans businessman Clay Shaw to that effect in 1969, which ended in Shaw's acquittal. Garrison believed the assassination was the result of a conspiracy involving the CIA, the Mafia and other organizations. He wrote three published books, one of which became a prime source for Oliver Stone's film JFK in 1991, in which Garrison was portrayed by Kevin Costner, while Garrison himself made a cameo appearance as Earl Warren. Description above from the Wikipedia article Jim Garrison, licensed under CC-BY-SA, full list of contributors on Wikipedia.