Pistorius murder trial glance: The unrelenting questions from the prosecutor

South African chief state prosecutor Gerrie Nel gestures as he explains a possible scenario of how Oscar Pistorius might have fired on his girlfriend Reeva Steenkamp during Pistorius' trial Monday, April 14, 2014, in Pretoria, South Africa.

South African chief state prosecutor Gerrie Nel gestures as he explains a possible scenario of how Oscar Pistorius might have fired on his girlfriend Reeva Steenkamp during Pistorius' trial Monday in Pretoria, South Africa.

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Pistorius conceded that he had no explanation for the fact that Steenkamp still had undigested food in her stomach eight hours after the athlete says they had dinner. Experts said that the stomach would normally be empty of food six hours after eating. Nel said the explanation was that Steenkamp ate much later, around 1 a.m. according to the state pathologist, because the couple was up late and arguing. Pistorius again denied the argument, but on the stomach contents he said: "I don't have an explanation."

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