First day of trial ends with defense lawyer looking at witness testimony . Oscar Pistorius ' neighbor hears ` ` a scream '' Pistorius shot and killed Reeva Steenkamp at his Pretoria home last year . The sprinter 's lawyers will argue he was a man deeply in love with his girlfriend who made a terrible mistake . The double amputee Paralympic and Olympic sprinter says he mistook her for a woman .
First day of trial ends with defense lawyer looking at witness testimony . Oscar Pistorius ' neighbor hears ` ` a scream '' Pistorius shot and killed Reeva Steenkamp at his Pretoria home last year . The double amputee Paralympic and Olympic sprinter says he mistook her for a woman .