<Tr> <Th> Spouse (s) </Th> <Td> William Fifield (m . 1939--46) Fletcher Markle (m . 1950--62) </Td> </Tr> <Tr> <Th> Children </Th> <Td> John Lawrence Fifield Markle (1941 - 1987) (suicide) </Td> </Tr> <P> Carlotta Mercedes Agnes McCambridge (March 16, 1916--March 2, 2004) was an American actress of radio, stage, film, and television . Orson Welles called her "the world's greatest living radio actress ." She won an Academy Award for Best Supporting Actress for All the King's Men (1949) and was nominated in the same category for Giant (1956). She also provided the voice of' The Demon' in The Exorcist (1973). </P> <P> McCambridge was born in Joliet, Illinois, the daughter of Irish American Roman Catholic parents Marie (née Mahaffry) and John Patrick McCambridge, a farmer . She graduated from Mundelein College in Chicago before embarking on a career . </P>

Who did the demon voice in the exorcist