Smith appeared twice on the ABC/Warner Brothers western series "Colt .45", starring Wayde Preston. He was cast as The Comanche Kid in "Gallows at Granite Gap" (November 8, 1957), with Virginia Gregg as Martha Naylor and Stuart Randall, later a recurring character with Smith on "Laramie", as Sheriff Mort Cory. The child actor Ken Osmond was cast as Tommy. Smith subsequently appeared on "Colt .45" as Shelby Taylor in "Point of Honor" (March 21, 1958). In this episode Cameron Mitchell portrayed Dr. Alan McMurdo.