Warning: SPOILERS lie ahead for the Yellowstone series finale!Rainwater’s efforts to acquire the Dutton Ranch have come to an end in the Yellowstone series finale. Played by Gil Birmingham since the show’s launch, Thomas Rainwater is the Chief of the Broken Rock Indian Reservation and was introduced as an antagonist to Kevin Costner’s John Dutton III, working to reclaim the land the Duttons call home for his people. As the show has progressed, though, and other threats have come to Montana, Rainwater and Dutton have steadily had to put their differences aside to work together to protect those they care about.

https://screenrant.com/yellowstone-season-5-gil-birmingham-interview-post-mortem/