Spoiler warning! 'Yellowstone' signs off (for now?) with a major character death and more full-circle moments in the season 5 finale, which aired on Paramount Network. Beth Dutton (Kelly Reilly) gets revenge over the role Jamie (Wes Bentley) played in their father's murder, killing her brother in the aptly titled episode, 'Life Is a Promise.' As for the ranch, Kayce Dutton (Luke Grimes) agrees to sell his family's Montana estate to Chief Thomas Rainwater (Gil Birmingham), confirming fan theories that Jacob Dutton's agreement in '1883' would come into play during the season's final moments. This comes days after 'Deadline' reported that a spin-off was in the works, with Taylor Sheridan continuing Beth and Rip Wheeler's love story in a brand-new series.