John Rutter, 42, was found guilty Monday of perjury, among other charges, and now faces up to six years in prison.
The jury of seven women and five men did not believe that Rutter had been given permission by Diaz to sell the photos.
Rutter admitted to asking Diaz for $3.5 million for the photos, otherwise, he was going to sell them to a European magazine.
Sentencing for Rutter is scheduled for September 15.