prosecutor diana garcia also called three officers who responded to the scene. officer andrew bryant was the one who arrested sanchez. he's one of the officers in the cell phone video of the arrest. during the preliminary hearings, prosecutor diana garcia called a ballistics expert who showed the gun similar to this one that sanchez is accused of firing. public defender matt gonzalez called only one witness, but he was crucial to his defense, that the gun went off accidentally. form sfpd crime lab director jim norris said last week that he supported gonzalez' theory that it was an accidental discharge. that based on earlier testimony from an investigator that the bullet struck the peer walkway first, then ricocheted, hitting steinle in the back. >> i believe that while the defendant was aware that something had happened with this thing that he was holding, i actually don't believe he was aware that someone was shot on the pier. >> reporter: so the preliminary hearing continues tomorrow morning and the judge is expected to make a ruling tomorrow. vic lee, abc 7 n