Oscar Pistorius arrived at this South Africa court on Wednesday to give his third day of testimony in his murder trial.br br And to walk into this...br br Some very difficult cross examination.br br During a day of dramatic testimony, Prosecutor Gerrie Nel confronted Pistorius with this gruesome photo.br br It shows the head of Pistorius' girlfriend, Reeva Steenkamp, after he'd shot her in the skull.br br (SOUNDBITE) (English) PROSECUTOR GERRIE NEL, SAYING:br br "Have a look there, I know you don't want to because you don't want to take responsibility, but it's time that you look at it , take responsibility for what you've done, Mr. Pistorius"br br Pistorius admits to shooting Steenkamp in his home on Valentine's Day last year, but insists he mistook her for an intruder.