a january 2013 incident where a friend's gun was passed to him under a table when it accidentally went off in pistorius' hands. >> he did apologize and say are you okay, is everybody okay. >> reporter: he asked his friend to take the blame. >> i remember him saying, just just say it was you. i don't want any attention around me. >> reporter: the accidental discharge happened just a few weeks before he shot his girlfriend dead in his bathroom. pistorius has pleaded not guilty to all the charges. after the launch break, all eyes are going to be on further testimony from this doctor and of course the corrosion. >> it's being all this testimony about this shun shot a few days or weeks before this. that may not have come into an american trial.