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Jacob Leon Rubenstein (March 25, 1911 – January 3, 1967), who legally changed his name to Jack Leon Ruby, was a nightclub operator in Dallas, Texas who murdered Lee Harvey Oswald, the assassin of President John F. Kennedy. Ruby was originally from Chicago, Illinois; he moved to Dallas in 1947. Convicted of Oswald's murder, Ruby appealed his conviction and death sentence and was granted a new trial. As the date for his new trial was being set, he became ill and died of lung cancer.
Some contend Ruby was involved with major figures in organized crime, and conspiracy theorists widely assert that Ruby killed Oswald as part of an overall plot surrounding the assassination of President Kennedy. Others have disputed this, arguing that Ruby's connection with gangsters was minimal at most, or circumstantial, and also that Ruby was not the sort to be entrusted with such an act within a high-level conspiracy.