Bonanza: Season 13, Episode 22
He Was Only Seven (5 Mar. 1972)
Jamie's 7-year-old friend, Jonah Morgan, is badly wounded when he and Jamie walk into the Virginia City Bank during a robbery by the evil Springer gang. The boy later dies of his injuries. Joe and Jamie accompany Jonah's grief-hardened, paraplegic grandfather on the hunt for Springer and his cronies.