In her autobiography, All Those Tomorrows, published in 1985, Zetterling details love affairs with actor Herbert Lom and later Tyrone Power, with whom she lived from 1956 until early 1958. She was married to Norwegian actor Tutte Lemkow from 1944 to 1953. Lemkow and Zetterling had a daughter, Etienne and a son, Louis, who is professor of environmental sociology at the Autonomous University of Barcelona. From 1958 to 1976 she was married to British author David Hughes, who collaborated with her on her first films as Director. She died in London, from cancer on 17 March 1994, at the age of 68, a year after her final role on television. Recently released documents at the National Archives in London show that she, a member of the Hollywood Left, was watched by British security agents as a suspected Communist. However, the UK never had a system along the lines of the American Hollywood Blacklist. She died in her home.