Sister of Oscar Pistorius Aimee Pistorius, center, attends his murder trial as chief prosecutor Gerrie Nel questions Oscar Pistorius in court in Pretoria, South Africa, Monday, April 14, 2014. Pistorius who is charged with the murder of his girlfriend Reeva Steenkamp on Valentine's Day in 2013, is being cross-examined at his trial for the fourth day by Nel. (AP Photo/Kim Ludbrook, Pool)