Cahill U.S. Marshal is a 1973 American Western film in Technicolor starring John Wayne as a driven lawman in a black hat. While J.D. Cahill (John Wayne), a widower and U.S. Marshal, is away from home, his two sons Danny (Gary Grimes) and Billy (Clay O'Brien) aid Abe Fraser (George Kennedy) and his gang to escape from jail and to rob a bank. The town's sheriff is shot and killed during the robbery. Billy hides the stolen money while his brother and the rest of the gang return to locked jail cells as an alibi. When Cahill returns, he and Danny look for the perpetrators with the help of half-Comanche tracker Lightfoot (Neville Brand). Cahill arrests four suspects and although they are innocent, they are found guilty and scheduled to be hanged.