Believe it or not, DeForest Kelley almost had one more shot—he did four–at appearing in a Tombstone-related movie or TV episode.
He’d played Morgan Earp in 1957’s Gunfight at the OK Corral—and lived, unlike the real Morgan. The sequel, Hour of the Gun, came out in 1967 and producers demanded that different actors play the main roles. There were two exceptions: John Hudson, who played Virgil Earp and DeForest Kelley. Kelley wanted to take the part—he really liked doing Westerns—but shooting for Star Trek prevented his taking the job.