Yellowstone's Marshals spinoff has already featured guest appearances from country stars - but who does musician Riley Green play? During the Sunday, March 8, episode of the Yellowstone spinoff, Cal (Logan Marshall-Green) and Andrea (Ash Santos) shared a drink at the local bar - the Four Sixes - country singer Ashley Cooke performed her song "Next to You" on stage. Ahead of Cooke's surprise cameo, it was announced that Green, 37, will appear in multiple episodes later in the season. "I'm so excited to be joining the cast of Marshals.