Joanna Moore (born Dorothy Joanne Cook) was an American film and television actress, who between 1956 and 1976 appeared in 17 feature films and guest-starred in nearly a hundred episodes of television series. After 1976, personal problems thwarted her career and her only remaining assignments consisted of two minor film roles. From 1963 to 1967, she was married to actor Ryan O'Neal, with whom she had two children, Griffin O'Neal and Tatum O'Neal. Moore's career hit its peak in the 1960s. During that time, she guest-starred in several popular shows, including Alfred Hitchcock Presents, Perry Mason, The Fugitive, Bewitched, and The Real McCoys. One of her more notable recurring roles was as Sheriff Andy Taylor's love interest, Peggy "Peg" McMillan in four episodes of The Andy Griffith Show, from 1962 to 1963. Moore was a guest star in such television Westerns as The Rifleman, Wagon Train, Gunsmoke, The Rebel, The High Chaparral, and The Virginian. By the 1970s, her career began to wane because of drug and alcohol misuse. Moore made her final onscreen appearance in 1986, and died of lung cancer in 1997.