TOPSHOTS South African Paralympic track star Oscar Pistorius reacts as he listens to evidence by a pathologist during his trial in court in Pretoria on April 7, 2014. As the defence opens its case, the 27-year-old Paralympian will give the court his first account of why he shot dead his model girlfriend Reeva Steenkamp in the early hours of Valentine's Day in 2013. AFP PHOTO / POOL / THEMBA HADEBE