Transcript for Dramatic Day in Court As Oscar Pistorius Describes the Shooting
We turn to a grouping turn of events in the most watched murder trial around the globe. Oscar miss topistorius removed his prosthetic legs and broke down sobbing as he gave his version of what happened in the moment he killed his girl. Reporter: Today, Oscar Pistorius describing for the first time publicly, the chilling moment he realized he'd killed his girlfriend, the reality star reeva steenkamp. I don't know how long I stood there for. Reporter: When the words stopped, the sobbing began. The judge abruptly leaving the court Rom room. Pistorius walking out of court. We watched as he started to sob and whale and put his head in his hands. Reporter: In earlier testimony he said he headed to bed Har moan youly with steenkamp that night to waking up to what he thought was intrude des. The moment that everything changed. Reporter: Going into combat mode. The first thing that ran through my mind was that I needed to protect reeva and I needed to get my gun. Reporter: He testified he called for her but says he heard nothing. At this point reeva's mother covering her eyes. Before I knew it I had fired four shots at the door. My ears were ringing. I couldn't hear anything. So I shot -- I kept on shouting for reeva to phone the police. Reporter: She had died. Another dramatic moment. He was asked to remove his prosthetic legs in court and stand by the bullet ridden bathroom door. Trying to show his vulnerability at the time of the shooting. We expect him back on the stand tomorrow. But tonight legal analysts are telling us all the emotion might be harming his case. They may be muddied by all of that sobbing. Thank you. Now we head to Ukraine a country on a hair trigger.
This transcript has been automatically generated and may not be 100% accurate.