Murder Trial Begins for Olympic "Blade Runner" Oscar Pistorius - NBC Right Now/KNDO/KNDU Tri-Cities, Yakima, WA |

Murder Trial Begins for Olympic "Blade Runner" Oscar Pistorius

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PRETORIA, South Africa - A neighbor of Olympic runner Oscar Pistorius says she heard a woman's "blood-curdling" screams before the sound of four gunshots on the night Pistorius killed his girlfriend.

The neighbor was the first witness to testify at Pistorius' murder trial that began Monday in Pretoria, South Africa.

Her testimony contradicts Pistorus' version of events -- because he has said he thought his girlfriend, Reeva Steenkamp, was in bed at the time of the shooting, and he did not describe any woman screaming.

The double-amputee track star says he accidentally killed Steenkamp thinking she was someone who broke into his home. Prosecutors say they believe Pistorius shot and killed her during a fight on Valentine's Day of 2013.

Among those in court Monday, was Steenkamp's mother, who says she was there to "really look him in the eyes."