Police ballistics expert, Captain Christian Mangena points out evidence on the bathroom door, which Olympic and Paralympic track star Oscar Pistorius used a cricket bat to break down after shooting through it, during Pistorius' trial at the North Gauteng High Court in Pretoria May 9, 2014. Pistorius is on trial for killing his 29-year-old girlfriend Reeva Steenkamp at his suburban Pretoria home on Valentine's Day last year. Steenkamp died almost instantly after being hit by four hollow-point 9mm rounds fired through the door. REUTERS/Themba Hadebe/Pool (SOUTH AFRICA - Tags: SPORT ATHLETICS CRIME LAW)