Larry Martin Hagman was an American film and television actor, director, and producer, best known for playing ruthless oil baron J. R. Ewing in the 1978–1991 primetime television soap opera Dallas, and the befuddled astronaut Major Anthony Nelson in the 1965–1970 sitcom I Dream of Jeannie. Hagman had supporting roles in numerous films, including Fail-Safe, Harry and Tonto, S.O.B., Nixon, and Primary Colors. His television appearances also included guest roles on dozens of shows spanning from the late 1950s until his death, and a reprise of his signature role on the 2012 revival of Dallas. Hagman also worked as a television producer and director. He was the son of actress Mary Martin. Hagman underwent a life-saving liver transplant in 1995. He died on November 23, 2012, from complications of acute myeloid leukemia.

John Ross "J.R." Ewing Jr. is a fictional character in the American television series Dallas (1978–1991) and its spin-offs, including the revived Dallas series (2012–2014). The character was portrayed by Larry Hagman from the series premiere in 1978 until his death in late 2012; Hagman was the only actor who appeared in all 357 episodes of the original series. As the show's most famous character, J.R. has been central to many of the series' biggest storylines. He is depicted as a covetous, egocentric, manipulative and amoral oil baron with psychopathic tendencies, who is constantly plotting subterfuges to plunder the wealth of his foes. In the PBS series Pioneers of Television, Hagman claimed the character of J.R. began its development when he played a similar character in the film Stardust, and that he was also inspired by a mean boss he once had.