Landau won an Academy Award for his supporting role as Bela Lugosi in the 1994 Tim Burton film "Ed Wood."
But by that time he already had a deep resume in Hollywood, including appearances in such classics as "North by Northwest," "Cleopatra" and his Oscar-nominated role in "Tucker."
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Before his death, he was the oldest living Academy-Award winner for the supporting actor category.
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Landau died Saturday afternoon at UCLA Medical Center after a short hospitalization, his publicist said.
He had been working on a still-untitled memoir and a documentary is already underway about his life entitled "An Actor's Actor: The Life of Martin Landau."
DEVELOPING: This story will be updated.