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 1980s primetime television soap opera Dallas, and befuddled astronaut Major Anthony "Tony" Nelson in the 1960s 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 reprisal of his signature role on the 2012 revival of Dallas. He also worked as a producer and director on television. Hagman was the son of actress Mary Martin. He underwent a life-saving liver transplant in 1995. He died on November 23, 2012, from complications of acute myeloid leukemia.

https://en.wikipedia.org/wiki/Larry_Hagman