Gunsmoke - Season 3 Episode 20 Claustrophobia

Ollie Ridgers is a free spirited man who hates towns and lives free on the prairie. His friend Jim Branch convinces Ollie to go into Dodge for a good time at Miss Kitty's saloon. While Ollie is in town, two men kill Ollie's hogs and mule. Ollie goes after the two men thus killing one of the men. Matt is forced to arrest his good friend Ollie for killing one of the men. After Ollie has been found guilty of murder and sentenced to a long prison term, Ollie's friend, (Jim Branch) kills Ollie to spare Ollie from the cruelty of being being incarcerated for the rest of his life.