Investigating officer Hilton Botha said: "I believe he [Pistorius] knew she [Reeva Steenkamp] was in the bathroom".
Oscar Pistorius has his head bowed as he sits slumped in the dock.
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An ejector seat manufacturer is to be prosecuted over the death of Red Arrows pilot Sean Cunningham at RAF Scampton in November 2011.
Police said the "active shooter", reportedly a lawyer, had since been shot by officers and they were not seeking any other suspects.