Did Larry Hagman and Fred de Cordova both act in the show "Dallas"? 
Larry Hagman: Larry Martin Hagman (September 21, 1931 November 23, 2012) 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". Fred de Cordova: Frederick Timmins "Fred" de Cordova (October 27, 1910 – September 15, 2001) was an American stage, motion picture and television director and producer.
i don't know