In 1967, Monroe appeared in the episode "The Kidnappers" in Irwin Allen's show, The Time Tunnel. Monroe also appeared in other television shows including Gunsmoke, The Silent Force, Emergency!, Adam-12, Mission: Impossible, Mannix, The Amazing Spider-Man, Wonder Woman, The Dukes of Hazzard, and The Incredible Hulk. His other film credits included Adam at 6 A.M. (1970), Walking Tall (1973), and as an old timer in Speedway Junky (1999). His final appearance was in an episode of Medium in 2005.