South African Paralympic track star Oscar Pistorius reacts during his trial at the North Gauteng High Court on April 16, 2014 in Pretoria. The prosecution on Wednesday derided a forensic expert hired by Oscar Pistorius, accusing him of being unqualified to testify and rubbishing his account of the circumstances in which Reeva Steenkamp died. State prosecutor Gerrie Nel sought to prove that forensic geologist Roger Dixon was out of his depth in testifying about the lighting, sound and physical evidence inside Pistorius's home. AFP PHOTO / POOL - GIANLUIGI GUERCIA (Photo credit should read GIANLUIGI GUERCIA/AFP/Getty Images)
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