John and Michelle Phillips became Hollywood celebrities, living in the Hollywood Hills and socializing with stars such as Jack Nicholson, Warren Beatty, and Roman Polanski. The Mamas and the Papas broke up in 1968 largely because Cass Elliot wanted to go solo and because of personal problems between Phillips, his wife Michelle, and Denny Doherty, including Michelle's affair with Doherty. As Michelle Phillips later recounted, "Cass confronted me and said 'I don't get it. You could have any man you want. Why would you take mine (Doherty)?'" Michelle was fired briefly in 1966 for having affairs with Gene Clark and Doherty, she was replaced for two months by Jill Gibson, their producer Lou Adler's girlfriend. Although Michelle Phillips was forgiven and asked to return to the group, the personal problems continued until the group split. Cass Elliot went on to have a successful solo career until her death from heart failure in 1974.