PRETORIA, South Africa – Oscar Pistorius wept Tuesday as his defense lawyer read the athlete's account of how he shot his girlfriend to death on Valentine's Day, claiming he had mistaken her for an intruder.

Prosecutors, however, told a packed courtroom that the double-amputee known as the Blade Runner intentionally and mercilessly shot and killed 29-year-old Reeva Steenkamp model as she cowered inside a locked bathroom.

Pistorius told the Pretoria Magistrate's Court at a bail hearing he felt vulnerable in the presence of an intruder inside the bathroom because he did not have on his prosthetic legs on, and fired into the bathroom door.