Yellowstone's spinoff Y: Marshals is hinting at some surprising changes for Luke Grimes' Kayce Dutton. In Us Weekly's exclusive teaser, Kayce has joined the U.S. Marshals as he tells his fellow recruits, "I am just grappling with some skeletons I would like to keep in my closet." Other sneak peek clips have hinted at a shakeup that will shift Kayce's story. "I'm changing paths," he added in another glimpse at the highly-anticipated CBS series. "Trying to find a new beginning.