Claim: Yellowstone Kelly is a film based on fiction, starring Clint Walker.
Evidence: Yellowstone Kelly is a 1959 American Western film based upon a novel by Heck Allen (using his pen name Clay Fisher, which shows in the film credits) with a screenplay by Burt Kennedy starring Clint Walker as Luther Sage "Yellowstone" Kelly, and directed by Gordon Douglas. The novel was based on the real life Luther Kelly.