<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> 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>
who did the demon voice in the exorcist
who did the demon voice in the exorcist
Carlotta Mercedes Agnes McCambridge
Carlotta Mercedes Agnes McCambridge