South African Paralympic athlete Oscar Pistorius (right), accused of murdering his girlfriend, speaks to his defense team during a break on the second day of his trial at the North Gauteng High Court in Pretoria, South Africa, on Tuesday. AFP PHOTO
PRETORIA: Lawyers for Paralympian Oscar Pistorius for a second day on Tuesday grilled a key witness at his murder trial who claims to have heard screams, then shots, as his girlfriend was killed.