pistorius fired his gun and neighbor michelleberger said she heard the fatal gunshots. >> could you giveby using bang. >> bang. bang. bang. bang. >> on day four of the trial, next door neighbor physician took the stand. the first to arrive at the pistorius home that night. >> i remember the first thing he said when i got there was, "i shot her. i thought she was a burglar. and i shot her." while he tended to reeva steenkamp's lifeless body, pistorius was distraught and rependant. >> he was crying. he was praying. he was talking to god, telling god to please let her live. please don't let her die. he was making promises to god. he was trying to maybe get atonement. very, very distraught. >> his account left pistorius distressed, perhaps convulsing according to one courtroom observer. >> you have prepared a report? >> the prosecution then turned to its forensic experts and evidence. first up, the police colonel and pistorius' bullet holed toilet door. >> just hit from where you are standing. hit. trying to chip away at pistorius' version, the prosecution attacks his claim that he wore pros