Cara Delevingne has joined the cast of Only Murders in the Building in a series regular role for the Hulu comedy’s upcoming second season, the streaming service said Wednesday. The first season of Only Murders in the Building, which was co-created by Steve Martin and John Hoffman and aired between August and October, followed strangers Steve Martin, Oliver (Martin Short) and Mabel (Selena Gomez) who share an obsession with true crime and suddenly find themselves wrapped up in one of their own.