PRETORIA, South Africa (NBC News) -- Oscar Pistorius' ex-girlfriend Samantha Taylor took the stand at the Olympian's murder trial on Friday.
Taylor, 20, was asked about what the South African sprinter sounded like when he screamed. Pistorius' defense team has previously suggested that a "blood-curdling" scream heard by a neighbor on the night he fatally shot girlfriend Reeva Steenkamp was actually the Olympian.
The double-amputee is accused of premeditated murder over the Valentine's Day 2013 killing of Steenhamp, a 29-year-old law graduate and model. Pistorius insists he killed Steenkamp accidentally after mistaking her for an intruder.
The trial continues.