Orson Welles once called her the “world’s greatest living radio actress.” The director William Friedkin once said that The Exorcist would not work without the contribution of the woman who gave voice to the demon Pazuzu. But Mercedes McCambridge, award-winning actress of radio, stage, and screen, initially went uncredited for what should have been her most famous role. An actress who specialized in playing tough women and a ferocious advocate for those struggling with addiction to alcohol, she was known for her incredible voice—and she was not afraid to use it. This is the story of Mercedes McCambridge.

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