John Mitchum was an American actor from the 1940s to the 1970s in film and television. Born in Bridgeport, Connecticut, and the younger brother of Julie Mitchum and Robert Mitchum, he initially appeared in only unbilled and extra roles before gradually receiving bigger character parts in middle age. Mitchum supported his more famous brother on several occasions and was featured as the cop Frank DiGiorgio in the first three Dirty Harry films.
In 1958, Mitchum was cast in two episodes of the CBS crime drama, Richard Diamond, Private Detective, starring David Janssen. He played Joe in the episode "Short Haul" and Jimmy Logan in "Bungalow Murder".
On September 15, 1959, Mitchum appeared in the premiere episode "Stage Stop" of NBC's Laramie western series. The episode explains how series characters Slim Sherman and Jess Harper, played by John Smith and Robert Fuller, respectively, become partners in the Sherman Ranch and Relay Station. Jess arrives in Wyoming from Texas in search of an erstwhile "friend", Pete Morgan, played by John Mitchum, who had robbed Jess. Morgan is part of the gang of Bud Carlin, played by Dan Duryea. The gang captures Judge Thomas J. Wilkens, portrayed by Everett Sloane, to keep him from trying Morgan. Though Jess and Slim are at odds with each other in their first encounters, and friendshipn seems out of the question, Andy Sherman, played by Robert L. Crawford, Jr., takes an instant liking to Jess and ask Jess to take him away from the ranch, where he lives with his older brother Slim. Slim and Jess must fight together when Carlin shows up at the relay station and proceeds to humiliate the judge.