Lawman (1958)

Season 3: Episode 6

Yawkey, who has killed 27 men and has the reputation of being the fastest gun alive, shows up at the Bird Cage and sends notice to Dan that he's going to kill him at 3:30 that afternoon. Dan's never met him, and doesn't know why he wants to kill him. Both Johnny and Lily try to talk Yawkey out of it, to no avail. Dan is determined to do his job regardless of the consequences, much to Lily's dismay. The end is a study in the life of a gunslinger.