Wikimedia Commons/Marshals CBS TV Arielle Kebbel channels her neighbor Martha Stewart in 'Marshals,' the new Yellowstone spin-off. Premieres Sunday on CBS. April 4, 2026 AceShowbiz - When Arielle Kebbel learned about a new character casting for CBS' "Yellowstone" spin-off, Marshals, she knew it was a perfect fit. The role was described as "Martha Stewart in cowboy boots," and Kebbel's immediate thought was, "I know Martha, she's my neighbor!" The show, premiering Sunday at 8/7c, stars Luke Grimes reprising his role as Kayce Dutton, now a U.S.