Co-author of the book 'The Holy Blood and the Holy Grail,' Richard Leigh arrives at the Royal Courts of Justice in London in this Tuesday Jan 16, 2007 file photo. Leigh, a writer of alternative history who unsuccessfully sued for plagiarism over themes in Dan Brown's blockbuster novel "The Da Vinci Code," has died, his agent said Friday Niv. 30, 2007 . He was 64. (AP Photo/Alastair Grant)

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