The Rifleman - Season 1 Episode 4
The Marshal

Micah Torrance, a once famous lawman, is introduced as a drunken derelict, who stumbles into North Fork. Micah, nursing an arm crippled in a gunfight, is hired by Lucas to help out at the ranch. Three outlaws ride into town looking for revenge against Micah. When they kill the sheriff, its up to Lucas and Micah to protect North Fork. Micah becomes North Forks full-time Marshal.