There are three pretty big clues that Monica Dutton is not a part of the new Yellowstone spinoff Marshals, but I can't quit thinking about the one clue that says she is. Luke Grimes returns as Kayce Dutton for the new Yellowstone spinoff Marshals. Here's why I think the latter is true and we will see a Kayce and Monica reunion come March. Marshals Trailer BreakdownFind all of the clues in the first 25 seconds and the last 25 second of the official trailer for Marshals. I'm just gonna say it — it looks like Monica Dutton.