John Wayne turned down the role of Marshal Matt Dillon for fear of being type cast as a cowboy.
Not really true...He was never really considered and was never offered the role. Wayne did recommend James Arness for the role. Others who auditioned for the role was Richard Boone, Denver Pyle, Robert Conrad & Raymond Burr.
John Wayne was however offered the role of Dirty Harry and that was after it was turned down by Frank Sinatra. I'm glad neither worked out, it's hard to picture anyone else.
This post was edited on 10/10 at 12:22 pm