Results of forensic tests released on Wednesday could be crippling to the defense of a Florida neighborhood watch captain who is charged with murdering 17-year-old Trayvon Martin.

Documents released by the State Attorney's Office for the Fourth Judicial Circuit ruled out the possibility that Martin's DNA was on the grip of George Zimmerman's gun, according to the Orlando Sentinel. The Florida Department of Law Enforcement could find no evidence that Martin had handled the weapon.

Zimmerman had told police that he was forced to shoot Martin because the teen was on top of him, slamming his head into the concrete and had tried to take the concealed pistol from the holster on his waist.

Other tests were inconclusive as to whether or not Martin's DNA was on the holster, WKMG reported. Zimmerman's DNA, however, was found on both the gun and the holster.

Witness diagrams and several hundred photos were also released on Wednesday, but they reportedly revealed little new information.

Zimmerman was charged with second-degree murder earlier this year. He has pleaded not guilty and is claiming that he acted in self-defense.