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Duvall died Thursday in her sleep at her home in Blanco, Texas, her longtime partner, Dan Gilroy, announced. The cause was complications of diabetes, said her friend, the publicist Gary Springer.
“My dear, sweet, wonderful life, partner, and friend left us last night," Gilroy said in a statement. “Too much suffering lately, now she’s free. Fly away beautiful Shelley.”
Duvall was attending junior college in Texas when Altman's crew members, preparing to film “Brewster McCloud,” encountered her as at a party in Houston in 1970. They introduced her to the director, who cast her in “Brewster McCloud” and made her his protege.
Duvall would go on to appear in Altman films including “Thieves Like Us,” “Nashville, “Popeye,” “Three Women” and “McCabe & Ms. Miller.”
“He offers me ... good roles,” Duvall told The New York Times in 1977. “None of them have been alike. He has a great confidence in me, and a trust and respect for me, and he doesn’t put any restrictions on me or intimidate me, and I love him. I remember the first advice he ever gave me: ‘Don’t take yourself seriously.’”
Duvall, gaunt and gawky, was no conventional Hollywood starlet. But she had a beguiling frank manner and exuded a singular naturalism. The film critic Pauline Kael called her the “female Buster Keaton.”
“How would you feel if were really nice, and then, suddenly, on a dime” — she snapped her fingers — “they turn on you?” Duvall told the Times. “You would never believe it unless it happens to you. That’s why you get hurt, because you can’t really believe it’s true.”