Young Billy Young is a 1969 western movie starring Robert Mitchum and featuring Angie Dickinson, Robert Walker, Jr. in the title role, David Carradine, Jack Kelly who plays a villain and dresses exactly as he had for his role on televisions Maverick, Deana Martin and Paul Fix. The film was written by Heck Allen from his novel and Burt Kennedy, and directed by Kennedy.

Kane lets young Billy accompany him to a town in New Mexico where he has a job waiting for him as deputy sheriff. Kanes real aim is to find the man who murdered his son.In town, Kane learns from dancehall girl Lily Beloit that two men who run the town, John Behan and Frank Boone, secretly intend to gun down Kane first chance they get. Frank Boone may be the one Kane is looking for, but Jesse, who is Franks son, lands in jail first, accused of shooting Doc Cushman. ........

Source: Wikipedia