The author of a new Bill Cosby biography is apologising for not pursuing allegations that the comedian had drugged and sexually assaulted numerous women.
Mark Whitaker, whose Cosby: His Life and Times was published in September, tweeted on Monday that he was wrong not to "aggressively" look into the charges and promised to address them "at the appropriate time".
Whitaker's book has been widely criticised for idealising Cosby, although some critics praised it upon release.
Amazon.com included Cosby among its best books of September and top 100 biographies and memoirs of 2014.
The book includes blurbs from David Letterman, Jerry Seinfeld and Mary Tyler Moore.
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Cosby co-operated with Whitaker, agreeing to be interviewed.
But, according to Simon & Schuster, Cosby had no control over the book's contents.
