Oscar Pistorius

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Oscar Pistorius, left, accompanied by relatives arrives at the high court in Pretoria, South Africa, Monday, March 24, 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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Oscar Pistorius, arrives at the high court in Pretoria, South Africa, Monday, March 24, 2014. The murder trial of Pistorius, who is charged with murder for the shooting death of his girlfriend, Reeva Steenkamp on Valentines Day in 2013, is beginning its fourth week. The prosecution has said it will wrap up its case against the double-amputee runner this week after calling four or five more witnesses, beginning Monday. The defense will then present its case. (AP Photo/Themba Hadebe, Pool)

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Oscar Pistorius, center, accompanied by relatives arrives at the high court in Pretoria, South Africa, Monday, March 24, 2014. The trial of Pistorius, who is charged with murder for the shooting death of his girlfriend Reeva Steenkamp on Valentines Day in 2013, is beginning its fourth week. The prosecution has said it will wrap up its case against the double-amputee runner this week after calling four or five more witnesses, beginning Monday. The defense will then present its case. (AP Photo/Themba Hadebe, Pool)

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State prosecutor Gerrie Nel, middle, questions a ballistics police officer in the witness box captain Christiaan Mangena, far right, during the Oscar Pistorius trial at the high court in Pretoria, South Africa, Wednesday, March 19, 2014. Pistorius is charged with shooting dead his girlfriend, Reeva Steenkamp, through the door, exhibitted in court foreground, on Valentines Day in 2013. (AP Photo/Themba Hadebe, Pool)

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Oscar Pistorius arrives in court in Pretoria, South Africa, Wednesday, March 19, 2014. Pistorius is on trial for the murder of his girlfriend Reeva Steenkamp on Valentine's Day in 2013. (AP Photo/Leon Sadiki, Pool)

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State prosecutor Gerrie Nel puts questions to a ballistics expert in court in Pretoria, South Africa, Wednesday, March 19, 2014, where athlete Oscar Pistorius is on trial for the murder of his girlfriend Reeva Steenkamp on Valentine's Day in 2013. (AP Photo/Themba Hadebe, Pool)

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June Steenkamp, mother of Reeva Steenkamp, left, sits with African National Congress Women's League spokesperson Jackie Mofokeng, right, during Oscar Pistorius' trial at the high court in Pretoria, South Africa, Wednesday, March 19, 2014. Pistorius is charged with murder for the shooting death of his girlfriend Reeva Steenkamp on Valentine's Day in 2013. (AP Photo/Themba Hadebe, Pool)

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Oscar Pistorius, listens to ballistic evidence being given in court in Pretoria, South Africa, Wednesday, March 19, 2014. Pistorius is on trial for the murder of his girlfriend Reeva Steenkamp on Valentine's Day in 2013. (AP Photo/Themba Hadebe, Pool)