Gunsmoke - Season 3 Episode 25 Dirt

Nat Seiber and Polly Troyman are to be married. When Polly's younger Brother finds out that Nat had visited another woman (Beulah)late one evening at her house, Polly's Brother (Henry Troyman) thinks that Nat has dishonored his Sister Polly and promises to stop the wedding anyway he can. When Nat is shot on his wedding day, everyone thinks Polly's Brother committed the shooting. After Matt and Chester do an investigation, Matt comes to another conclusion about the shooting of Nat Seiber.