PRETORIA, South Africa (AP) — The prosecutor in the Oscar Pistorius murder trial has told the world-famous athlete that he fatally shot his girlfriend through a toilet door as they were talking.

Chief prosecutor Gerrie Nel insists that Pistorius intentionally killed Reeva Steenkamp and put it Friday during cross-examination of the double-amputee Olympian that "she was standing behind the toilet door talking to you when you shot her."

Pistorius denied Nel's claim, saying "that's not true" in a dramatic exchange to end the first week of the runner's testimony at his trial.

Nel says the "only reasonable explanation" for the shooting last year is that Pistorius killed the model after a fight. Pistorius claims he shot Steenkamp by mistake thinking she was a nighttime intruder behind a toilet door in his bathroom.