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>> that night with reeva would be different. oscar fired his gun and his neighbor said she heart the fatal shot. >> tell me what you heard by using bang. >> bang, bang, bang, bang. >> stiff was one of the first to arrive at the pistorius home that night. >> i remember the first thing he said when i got there was that i shot her. i thought she was a burglar. and i shot her. >> stipp testified that while he tended to steencamp's lifeless body, pistorius was crying and repentant. >> he was crying, talking to god, telling god to please let her live, don't let her die. he was making promises to god...

Girlfriend testified. >> that is not true. he sounds like a man. >> she said that night wasn't the first time that pistorius feared an intruder entered his home. >> there was one occasion where something hit the bathroom window and oscar woke me up. and asked me if i heard it. so he got up with his gun and he walked out of the room. >> that night with reeva would be different. oscar fired his gun and michelle berger said she heard the fatal gunshots. >> can you give us a demonstration by using bang. >> bang, bang bang bang. >> on day four of the trial, johann stipp took the stand. he was one o...

>> bang. bang, bang, bang. >> cnn legal analyst danny cevallos and mark o'mara back with me now. danny, what do you think has been the most significant evidence? we just heard about the screaming. we heard about the demeanor of oscar pistorius. but in a week's worth of testimony in a prosecution case -- defense hasn't had its go yet -- what's been the most damming? >> i'm throwing out all this girlfriend he cheated on me evidence. that shouldn't come in. it comes in south africa, sort of brought in based on the unrelated gun charges prior to this case. so the lights in the bathroom are signifi...

Maybe get atonement. but he was very, very distraught. severely so. >> he was wanting you to help her. >> yes. definitely. >> he was, in fact, upset that you could not help her, because he wanted to go to the hospital. >> he definitely wanted her to live, yes. >> three other neighbors have also taken the stand, as well. one of them was michelle berger. she didn't want her face shown on camera. this is one of the rules. if you don't want your face shown in the trial, the cameras turn away. but the audio of michelle is gripping. >> the fear in that woman's voice is difficult to explain to the co...