Oscar Pistorius starts with apology , saying he can not imagine the pain he caused . Defense witness is questioned about Pistorius wounds , when she last ate . Oscar Pistorius defense teams will call 21 witnesses , lawyer Pistorius says . Pistorius says he thought Oscar Pistorius was an intruder and shot in self-defense .
Oscar Pistorius starts with apology , saying he can not imagine the pain he caused . Defense witness is questioned about Reeva Steenkamp 's wounds , when she last ate . Pistorius defense teams will call 14 to 17 witnesses , lawyer Barry Roux says . Pistorius says he thought Steenkamp was an intruder and shot in self-defense .