The Groom Wore Spurs (1951)

Actor Ben Castle is a phony singing cowboy who cannot ride, sing, or act, is afraid of guns and horses, and is the first one out the door when trouble breaks out. His studio hires attorney Abigail Furnival to get him out of trouble with a big-time gambler because he cannot pay off a gambling debt. The next thing she knows, she has married him. The gambler decides to write off the debt when he learns that Abigail is the daughter of an old friend. But the gambler is murdered, and Ben appears to be involved.