Originally Aired: May 15, 1960

Gunsmoke #423, "Tall Trapper," presents Marshal Matt Dillon with a puzzling murder case when Doc Adams discovers a woman beaten to death in a covered wagon east of Dodge. The victim, Cassie Riley, had been traveling west with her husband Riley in hopes the dry climate would improve her failing health. When Doc arrives to treat her, he finds she's already dead from a brutal beating. Riley tells Doc and Matt about a mysterious trapper who shared their camp for two nights, eyeing Cassie the whole time, making him the obvious suspect.

The case takes an unusual turn when Matt and Chester ride out to the murder scene and discover the body has been moved to a Pawnee burial platform high on wooden poles. There they encounter Ben, a laconic trapper raised by the Pawnees who admits to burying Cassie in the traditional elevated grave. Though Ben denies killing her and could have easily shot Matt and Chester before they drew on him, the evidence looks damning. As Matt brings Ben to jail and confronts the grieving Riley with his wife's suspected killer, the truth behind Cassie's death remains murky.