The official trailer for Yellowstone spinoff Marshals appeared to confirm the death of Kayce Dutton's wife, Monica, previously played by Kelsey Asbille. CBS released a first look at the series on Friday, January 23, which shows Kayce (Luke Grimes) in mourning following a personal loss. While Yellowstone fans know Kayce's father, John (Kevin Costner), died in the Paramount Network show's fifth and final season, a scene in the Marshals sneak peek has Kayce and son Tate (Brecken Merrill) watching a body be covered up in their home. "The only thing I ever wanted was taken from me," Kayce says.