Yellowstone star Luke Grimes has offered a reflection on the series ending with season 5, speaking about how long he’s been on the show. Grimes portrays Kayce Dutton, the estranged son of John Dutton (Kevin Costner) who is the most rebellious of the siblings. He has been on the show since its first episode and will be reprising the role in the rest of season 5, expected to air later this year.