An emotional Oscar Pistorius testifies in Day 17 of his murder trial.<br/> <br />The South African track star said the fatal shooting of girlfriend Reeva Steenkamp last year continues to haunt him.<br/> <br />(SOUNDBITE (English) OSCAR PISTORIUS, SPEAKING OFF CAMERA OVER VIEWS OF THE COURT, INCLUDING HIS SISTER AIMEE (DARK HAIR I N BLACK CLOTHING, WEEPING, SAYING (PARTIAL PICTURE BREAKUP DURING SOUNDBITE):<br/> <br />"I have terrible nightmares about things that happened that night where I wake up and I smell, I can smell, I can smell the blood and I wake up to being terrified."<br/> <br />Pistorius calls the shooting a mistake, saying he thought she was an intruder.<br/> <br />At one point, Pistorius apologized directly to the Steenkamp family.<br/> <br />(SOUNDBITE) (English) ATHLETE, OSCAR PISTORIUS, SAYING: (AUDIO ONLY - SOUNDBITE RUNS OVER FOLLOWING FIVE SHOTS)<br/> <br />"I can't imagine the pain and the sorrow and the emptiness that I have caused you and your family. I was simply trying to protect Reeva. I can pr
