Reeva Steenkamp was shot with bullets designed to expand on impact and cause maximum damage, Prof Gert Saayman testified after he identified the type of bullet from fragments in Steenkamp's skull.
Saayman's testimony was not broadcast or reported live on Twitter by journalists because of its explicit content under an order from Judge Thokozile Masipa. However, journalists were allowed to report the testimony without directly quoting the witness's words.
The judge also asked whether Pistorius was able to understand the proceedings. Roux said Pistorius' reaction was not going to change. A bucket was placed at his feet.
After court adjourned for the day, Pistorius sat for a few minutes with his hands over his ears and his body heaving and bent forward as his brother held a hand on his back.
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Saayman said that each of the three main gunshot wounds Steenkamp suffered could have been fatal in isolation. Steenkamp's right arm was also broken and she had multiple skull fractures, both because of the effect of bullets, Saayman said.
There was another wound on one of Steenkamp's hands, Saayman said. Steenkamp, a model and personality on a television reality show, was wearing a pair of sports shorts with a Nike logo, a former sponsor of Pistorius, and a black undershirt when she was shot, he said.