Season 1, episode 26.
Original air date: 1960.
Slade unwittingly serves as a messenger of death, delivering a booby- trapped Spanish Box to a beloved banker, and must quickly clear himself by finding the real killers before the town`s lynch mob musters his courage.
Cast: Scott Brady (Shotgun Slade), Donald Murphy (Hal Bates), Mari Aldon (Marge), Michael Hinn (Sheriff Fred Hadley), Byron Morrow (Conroy), George Kennedy (Tex), Maurice Wells (Norris) and Phil Schumacher (Barfly: uncredited).
From IMDB.