Image Credit: Paramount Network Marshals reintroduces Yellowstone fans to Kayce Dutton's (Luke Grimes) new ride with U.S. Marshals as they protect Montana. But one important character is missing from the spinoff series: Monica Dutton, who was played by actress Kelsey Asbille in the original Paramount Network show. After viewers found out Monica died, fans asked why the creative team killed her off. Luke even admitted in an interview that he was "incredibly bummed" that Kelsey wasn't asked to reprise her role in Marshals.