State prosecutor Gerrie Nel (L) questions forensic expert Colonel Johannes Vermeulen during the murder trial of Oscar Pistorius at the North Gauteng High Court in Pretoria, on March 13, 2014. The Paralympian pleaded not guilty to murder, although he admits killing  Reeva Steenkamp by shooting her through a locked bathroom door. He mistook her for a burglar in his house, saying he made a tragic but understandable mistake.The murder trial has been compared to that of the O.J. Simpson case in the United States 20 years ago. AFP PHOTO: Alet Pretorius/Pool        (Photo credit should read ALET PRETORIUS/AFP/Getty Images)