Luke Grimes is reprising his role as Kayce Dutton on the upcoming Yellowstone spinoff Y:Marshals, but not much else is known about the series. It will air on CBS in 2026, but fans have been waiting on details of the cast. Will any of Kayce's family members, namely wife Monica (Kelsey Asbille) and son Tate (Brecken Merrill) be joining the new show?

Marshall-Green will star opposite Luke Grimes, who reprises his role as Kayce Dutton from “Yellowstone,” in the new series. The show follows Grimes’ Kayce as he joins an elite unit of U.S. Marshals, combining his skills as a cowboy and Navy SEAL to bring justice to his home state of Montana, per the official logline.

And just like that, Logan Marshall-Green has joined the cast of CBS’ upcoming Yellowstone spinoff Y: Marshals. The spinoff follows Kayce Dutton (Luke Grimes), who leaves ranching life behind to join an elite unit of U.