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Model Reeva Steenkamp, 29, was shot four times in the early hours of Thursday by a 9mm pistol owned by the sprinter, and she died of her wounds at the scene.
Pistorius's family has insisted that the evidence will refute "any possibility of a premeditated murder or indeed any murder at all".
Defence lawyers are expected to argue that there are "exceptional circumstances" for Olympic athlete Pistorius to be freed pending trial.
As a result, more details will likely emerge of what happened during the Valentine's Day shooting at Pistorius's upmarket home in a gated estate in the South African capital.
The state, arguing premeditated murder, will oppose bail.
Both sides have called in heavyweight lawyers, setting the scene for a massive legal showdown.
In Port Elizabeth meanwhile, Steenkamp's family were preparing their final farewells.
In an interview published yesterday, Steenkamp's mother described her death as "horrendous."
