Oscar Pistorius

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Oscar Pistorius writes notes as he sits in the dock during his trial in court in Pretoria, South Africa, Thursday, March 13, 2014. Pistorius is charged with the shooting death of his girlfriend Reeva Steenkamp on Valentine's Day in 2013. (AP Photo/Alet Pretorius, Pool)

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State prosecutor Gerrie Nel, right, speaks as forensic investigator Johannes Vermeulen, left, watches during the Oscar Pistorius trial at the high court in Pretoria, South Africa, Thursday, March 13, 2014. Pistorius is charged with murder for the shooting death of his girlfriend, Reeva Steenkamp, on Valentines Day in 2013. (AP Photo/Themba Hadebe, Pool)

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Forensic expert Johannes Vermeulen, right, is questioned by state prosecutor, Gerrie Nel, left, as he gives evidence in court in Pretoria, South Africa, Thursday, March 13, 2014, in the Oscar Pistorius case. Oscar Pistorius is charged with the shooting death of his girlfriend Reeva Steenkamp in 2013. Prosecutors in the Oscar Pistorius murder trial on Thursday displayed a sequence of photos showing the blood stains and blood spatter found on the floors, walls, stairs and chairs in the athlete's house after he fatally shot his girlfriend. The door at centre is set up in court to graphically portray the toilet door through which Steenkamp was fatally shot. (AP Photo/Alet Pretorius, Pool)

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Oscar Pistorius covers his mouth with his hands as he listens to forensic evidence during his trial in court in Pretoria, South Africa, Thursday, March 13, 2014. Pistorius is charged with the shooting death of his girlfriend Reeva Steenkamp, on Valentines Day in 2013. (AP Photo/Alet Pretorius, Pool)

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Oscar Pistorius puts his hands to his head as he listens to forensic evidence during his trial in court in Pretoria, South Africa, Thursday March 13, 2014. Pistorius is charged with the shooting death of his girlfriend Reeva Steenkamp on Valentines Day in 2013. (AP Photo/Alet Pretorius, Pool)

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Oscar Pistorius, left, listens to cross examination during his trial in court in Pretoria, South Africa, Thursday, March 13, 2014, Pistorius is charged with the shooting death of his girlfriend Reeva Steenkamp on Valentine's Day in 2013. (AP Photo/Themba Hadebe, Pool)

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A family friend of the late Reeva Steenkamp holds a portrait of Steenkamp as she attends the trial of Oscar Pistorius during his trial in court in Pretoria, South Africa, Thursday, March 13, 2014. Pistorius is charged with the shooting death of girlfriend Steenkamp, on Valentines Day in 2013. (AP Photo/Alet Pretorius, Pool)

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Oscar Pistorius makes notes as he sits in the dock during his trial in court in Pretoria, South Africa, Thursday, March 13, 2014. Pistorius is charged with the shooting death of his girlfriend Reeva Steenkamp, on Valentines Day in 2013. (AP Photo/Alet Pretorius, Pool)

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Oscar Pistorius covers his face with his hands as he listens to forensic evidence during his trial in court in Pretoria, South Africa, Thursday, March 13, 2014. Pistorius is charged with the shooting death of his girlfriend Reeva Steenkamp, on Valentines Day in 2013. (AP Photo/Alet Pretorius, Pool)

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Oscar Pistorius covers his face with his hands as he listens to forensic evidence during his trial in court in Pretoria, South Africa, Thursday, March 13, 2014. Pistorius is charged with the shooting death of his girlfriend Reeva Steenkamp, on Valentines Day in 2013. (AP Photo/Alet Pretorius, Pool)

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Oscar Pistorius covers his head with his hands and a notebook as he listens to forensic evidence during his trial in court in Pretoria, South Africa, Thursday March 13, 2014. Pistorius is charged with the shooting death of his girlfriend Reeva Steenkamp on Valentines Day in 2013. (AP Photo/Alet Pretorius, Pool)

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Oscar Pistorius cradles his head in his hands as he listens to cross questioning about the events surrounding the shooting death of his girlfriend Reeva Steenkamp, in court during the second week of his trial in Pretoria, South Africa, Wednesday, March 12, 2014. Pistorius is charged with the shooting death of Steenkamp, on Valentines Day in 2013. (AP Photo/Alexander Joe, Pool)

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Forensic investigator Johannes Vermeulen, with a cricket bat in hand, demonstrates on a mock-up toilet cubicle, with the door, background, how the door could have been broken down with the bat, during the trial of Oscar Pistorius in court in Pretoria, South Africa, Wednesday, March 12, 2014. Pistorius is charged with the shooting death of his girlfriend Reeva Steenkamp, on Valentines Day in 2013. (AP Photo/Werner Beukes, Pool)

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Forensic investigator Johannes Vermeulen, left, with a cricket bat in hand, demonstrates on a mock-up toilet cubicle, with the door, how the door could have been broken down, during the trial of Oscar Pistorius in court in Pretoria, South Africa, Wednesday, March 12, 2014. Pistorius is charged with the shooting death of his girlfriend Reeva Steenkamp, on Valentines Day in 2013. (AP Photo/Werner Beukes, Pool)

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Oscar Pistorius sits in the dock as he listens to cross questioning about the events surrounding the shooting death of his girlfriend Reeva Steenkamp, in court during the second week of his trial in Pretoria, South Africa, Wedensday, March 12, 2014. Pistorius is charged with the shooting death of Steenkamp, on Valentines Day in 2013. (AP Photo/Werner Beukes, Pool)

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Oscar Pistorius sits in the dock as he listens to cross questioning about the events surrounding the shooting death of his girlfriend Reeva Steenkamp in court during the second week of his trial in Pretoria, South Africa, Wednesday, March 12, 2014. Pistorius is charged with the shooting death of Steenkamp, on Valentine's Day in 2013. (AP Photo/Alexander Joe, Pool)

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Oscar Pistorius makes notes as he sits in the dock listening to cross questioning about the events surrounding the shooting death of his girlfriend Reeva Steenkamp, in court during the second week of his trial in Pretoria, South Africa, Wednesday, March 12, 2014. Pistorius is charged with the shooting death of Steenkamp, on Valentines Day in 2013. (AP Photo/Alexander Joe, Pool)