In an affadavit read by his lawyer at his bail hearing, Pistorius, a double-amputee, said he felt threatened at the time because he had not put on his prosthetic legs before firing several bullets into his locked bathroom. It was then he said that he feared he may have made a horrible mistake.
From the Associated Press:
Then he realized that model Reeva Steenkamp was not in his bed. He says "It filled me with horror and fear ..."
He put on his legs, tried to kick down the door, then bashed it in with a cricket bat to find Steenkamp, 29, shot inside.
He said he ran downstairs with her, but "She died in my arms."