Grey's Anatomy season 21 adds One Tree Hill star
One Tree Hill star Sophia Bush has joined the cast of Grey's Anatomy for season 21. The Chicago PD actor is set to have a "huge recurring role" in the hit medical drama, according to Deadline. Bush will star as Seattle Presbyterian trauma surgeon Dr. Cass Beckman, whose husband David Beckman works at Grey Sloan as a cardiothoracic surgeon.