Wikimedia Commons/Marshals CBS TV Yellowstone spin-off Marshals reveals Monica's shocking offscreen death from cancer, as Kayce Dutton's emotional journey takes a dark turn in the new ser... April 24, 2026 AceShowbiz - The CBS series Marshals, a spinoff of Paramount Network's Yellowstone, has shocked fans by revealing the offscreen death of Monica, played by Kelsey Asbille. Monica was the wife of Kayce Dutton, portrayed by Luke Grimes, and her absence quickly became a central point of discussion following the March 1 episode.