The investigating officer Hilton Botha has said the prosecution have a witness who claims the lights in Oscar Pistorius' home were on after they heard the gunshots.
The defence lawyer questioned Botha's testimony on this point.
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It may never be known what happened when four band members of Viola Beach were killed when their plunged into a canal, an inquest has heard.
The UK's highest court has been told that a motion in Parliament does not have any bearing on the legal issue it is having to decide.