Born Dorothy Joanne Cook; she appeared in more than 80 films and television shows including Alfred Hitchcock Presents.
She was raised by her grandmother until she became incapacitated, at which point she was adopted by a wealthy family.
She checked into a rehabilitation center for an addiction to amphetamines in 1970.
She was married to actor Ryan O'Neal from 1963 to 1967.
She is the mother of Tatum O'Neal, who became the youngest actress to win an Academy Award for Best Actress when she was 10.