Initially, Yellowstone fans feared that Kelly Reilly and Luke Grimes, who play Beth and Kayce Dutton, were being written off the show following the season 3 finale bombshell. But now, all eyes are on the Dutton's patriarch, played by Kevin Costner. The final few moments in the season 3 finale episode, which aired last August, shows all three Dutton's under attack: a bomb exploded in Beth's office, gunmen stormed Kayce's office, and John was shot while helping someone on the side of the road.