Established actress who provided the demon's voice in The Exorcist and starred in the western drama Johnny Guitar.
She began her career as a radio actor.
She won two awards for her role in All the King's Men in 1949.
She married William Fifield in 1939, and the couple had a son named John before divorcing in 1946.
Orson Welles once called her the world's greatest living radio actress.