The Marshal The Rifleman : Season 1 Episode 4

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, it's up to Lucas and Micah to protect North Fork. Micah becomes North Fork's full-time Marshal.