Photographer John Rutter is accused of trying to blackmail Diaz over the pictures he took in 1992 and attempting to sell back to her in 2003 for $3.5 million, before the release of her film Charlie's Angels: Full Throttle.
Forensic document examiner Bruce Greenwood testified on July 18 that the signature on the release form appeared to be forged, after analyzing Diaz's handwriting.
Greenwood said he noted certain letters in Diaz's name were "slanted completely different" from the handwriting samples that he had received from her.
Forensic expert George Reis also said Diaz's signature was forged and that it appeared the publicity photograph was used to make the forgery.
Rutter, 42, is charged with attempted grand theft for the alleged blackmail scheme, forgery for the signature on the form and perjury for declaring in a separate civil case that the signature was authentic. If convicted, he could face up to six years in prison. An extortion charge has been dropped.
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