Keith Walker was an American writer, producer, and actor. He co-wrote the screenplay for the film Free Willy, and wrote for television series including The Fall Guy, Emergency!, Quincy, M.E. and M*A*S*H." He wrote 26 episodes of the Rod Serling hosted radio show The Zero Hour, all of them coming in the second, and final, season of the show. He appeared as an actor on television shows Mannix, The Rookies, Mission: Impossible, and Fantasy Island. Walker had a memorable role as Mr.