Yellowstone's spinoff introduced Kayce Dutton in a new line of work - but what is the job of a U.S Marshal? When viewers were introduced to Kayce (Luke Grimes) on Yellowstone, the member of the Dutton family worked as a livestock agent and commissioner for the Montana Livestock Association, which allowed him to protect cattle and enforce ranching laws. He also had a background as a former U.S. Navy SEAL. Kayce's former career came in handy when Marshals, which premiered in March 2026, followed his decision to become a marshal.