The book is scheduled to be published on Monday, and Mr. Marable had been looking forward to leading a vigorous public discussion of his ideas. But on Friday Mr. Marable, 60, died in a hospital in New York as a result of medical problems he thought he had overcome. Officials at Viking, which is publishing the book, said he was able to look at it before he died. But as his health wavered, they were scrambling to delay interviews, including an appearance on the Today show in which his findings would have finally been aired.

Malcolm X, the black nationalist, with his wife, Betty Shabazz, and their daughters Attallah, left, and Qubilah around 1962.
It is particularly critical of the celebrated Autobiography of Malcolm X, now a staple of college reading lists, which was written with Alex Haley and which Mr. Marable described as "fictive." Drawing on diaries, private correspondence and surveillance records to a much greater extent than previous biographies, his book also suggests that the New York City Police Department and the F.B.I. had advance knowledge of Malcolm X's assassination but allowed it to happen and then deliberately bungled the investigation.
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