The Virginian (1962)

S05E15 Vengeance Trail

Stacey finds himself in a life-or-death situation and ends up taking the life of a man attempting to rob him. Afterward, he brings the body back to the man's sister, who pleads with him to go before the Sheriff arrives. She fears that their younger brother, who is set to join the Shiloh cattle drive, will seek vengeance for his brother's death.