charles petty, performed this one. the results of the second autopsy were the same as the first. the bullet entered ernestine's back and came out through her stomach. >> i think that the evidence showed at that time, and still does, in my mind today, that martin frias shot and murdered ernestine perea. >> but the defense introduced some new evidence in the second trial. that ernestine was suicidal, and that slash marks on her wrists proved she had tried to kill herself numerous times before. >> i was able to document between the different stories and the medical records somewhere between five and maybe a dozen prior suicide attempts or suicide gestures. >> and moxley attacked the heart of the prosecution's case. the first point was frias' contention that he didn't hear the gunshot from the living room. acoustics expert, dr. harry hollien, provided an explanation. he conducted a test using the body of a dead horse covered with a fabric similar to ernestine's blouse with a 300 magnum rifle, similar to frias' rifle. the first shot 3 feet away from the horse was very loud. [ gunfire