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?

That information remains a mystery for now, but the network has announced one new face who will be appearing alongside Luke Grimes. Logan Marshall-Green will join the cast as Pete Calvin, a friend from Kayce's days in the military.

In the spinoff, Kayce, a former Navy SEAL, will join the U.S. Marshals in order to bring justice to Montana. The official logline says, "With the Yellowstone Ranch behind him, Dutton joins an elite unit of U.

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