Gunsmoke Season 10 Episode 17 Deputy Festus

Matt jails three rowdy trappers, then must leave for Hayes City. He leaves Festus in charge. Festus learns that one of the trappers is his cousin, so he lets them go on condition they get their horses and leave Dodge City. After they've left, someone finds Dave dead in the stable; Festus must go retrieve his cousin after Mr. Halligan says he saw the trappers attack Dave...