Gunsmoke (1955)

S4E7 Stage Hold-Up

While traveling on a stagecoach, Matt and Chester find themselves in the midst of a robbery that ends with the death of another passenger. To outsmart the criminals, Matt devises a clever trick to implicate them. When a mysterious cowboy shows up, he claims to know the location of one of the bandit's graves, leading Matt on a dangerous path to seek justice for the fallen.