In court, Pistorius, 27, held his hands over his ears and hunched over as radiologist Johan Stipp recounted how he could not find any signs of life on Steenkamp's bloody body.
Pistorius shot Steenkamp through a toilet door with a 9 mm pistol, hitting her in the head, arm and hip area and killing her. He says he thought she was a dangerous intruder. Prosecutors, however, say Pistorius killed Steenkamp intentionally after a loud fight. Three neighbors have testified to hearing a woman screaming and a man shouting before gunfire. The celebrated runner, the first amputee to run at the Olympics, faces a life sentence with a minimum of 25 years in prison before parole if convicted of murder.