Transcript for 'Blade Runner,' Oscar Pistorius, on Trial
And we move on, next, to the surprise testimony at the trial of limpian Oscar Pistorius. On trial for shooting his girlfriend in South Africa. Today, another champion athlete introduced a kind of twist in the case. Hamish Macdonald in the courtroom for us tonight. Reporter: Kevin lerena is a professional boxer, a friend of Oscar Pistorius, now a witness at his murder trial. A month before reeva steenkamp's killing, they were together with friends at this restaurant. One of them passed a gun under the table to Pistorius. Then -- A shot went off in the restaurant. And then, there was complete silence. I was in shock. Reporter: Amid the chaos, Pistorius asked his friend Darren fresco, who passed him the pistol, to take the blame. I do remember Oscar saying to Darren, just say it was you. I don't want any attention around me. Just say it was you. Reporter: This denied by the superstar athlete. But while it could help prove firearms charges he faces, and could hurt his credibility, it does not prove he murdered his girlfriend. Crucial to proving that is the sequence of events the night Pistorius killed reeva skeenkamp. Did witnesses hear screams before he shot through the bathroom door or after? It matters because it's alleged the couple was arguing before the shooting. This is the view of the trial Oscar Pistorius has. Behind him, his family. Before him, his defense team. And at the front of the room, the judge who'll decide his fate. He denies all of the charges. Hamish Macdonald, ABC news,
This transcript has been automatically generated and may not be 100% accurate.