The Rifleman
The Retired Gun
S1 E17:
When a famous gunfighter marries, he decides to retire. He and his wife settle down in North Fork and open a store. When three outlaws arrive in town, looking to best the gunman in a gunfight, he turns the other cheek. When he refuses to respond to their challenge, they wreck his store. Despite his wife's pleas, he puts on his gun belt and stands up against the outlaws.
Starring
Robert Webber, Wallace Earl, Jack Kruschen