He was cast in the early "Bonanza" episode "The Avenger" as a mysterious figure known only as "Lassiter" – named after his town of origin – who arrives in Virginia City, and helps save Ben and Adam Cartwright from an unjust hanging, while eventually gunning down one sought-after man, revealing himself as a hunter of a lynch mob who killed his father; having so far killed about half the mob, he rides off into the night, in an episode that resembles the later Clint Eastwood film "High Plains Drifter". Morrow later appeared in the third season "Bonanza" episode "The Tin Badge".