Yellowstone's Marshals spinoff shocked viewers with a dangerous ranch fire that resulted in country singer Riley Green's character Garrett suffering from second degree burns. During the Sunday, May 3, episode of the hit CBS series, Kayce (Luke Grimes) saw a fire break out in a barn on his property. He rushed over as Garrett was helping the horses in the stable escape but then things took a turn. Garrett was caught under a beam that fell and he subsequently suffered second degree burns.