Transcript for Murder Trial of 'Blade Runner' Oscar Pistorius
Ryan smithhank- theow M eyes on Oscar store blade runner, as he's called, on trial tomorrow for the shooting death of H tonight, new images of Pistorius ans gi agh ABC's hamish man South Africa for T. Reporter: That final deep breath before it begins, Oscar Pistorius is no stranger to big moments. Tomorrow may be his biggest. He'll enter the courtroom accused of ml girlfried. He faces a possi- This is probably the biggest trial of the century. Certainly so far it is. Reporter: The prosecu alleges pistorh steenkamp through a locked Ur- images emerged th Pistorius on a gun range shooting Theis it'll be claimed he ckls and gun happy but there is evidence too, just ten days before the killing, of a flirtatious and loving couple. The world will be watching. A dedicated cable channel has been launched just to cover these proceedings. That tension between this almost god-like character and the awful tragedy is something that no one can resist. Reporter: Pistorius claims he thought an intruder was in the home, said he acted in self-defense. ABC's "20/20" built a replica of the crime scene to examine crucial evidence from the bathroom where steenkamp was found. Prosecutors say what were two cell phones doing there? It would imply an argument. She just got up in the middle of the night to go to the bathroom and somehow brought two cell phones with her to leave outside the toilet? Y isn't Reporter: The trial I down for three weeks prosecutors alone Aring more than a hunsses so sideed T mucnger right up until the final moments before this trial, prosecutors had been waiting on help from the United States to un Pistorius' they now have that and say they're confidentng guilty erct Hamish Macdonald there on the scene every step for us. Hamish, thank you.
This transcript has been automatically generated and may not be 100% accurate.