Pistorius trial: 'Blade Runner' takes the stand

Oscar Pistorius reacts during his trial at the high court in Pretoria

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Stifling sobs, Oscar Pistorius took the witness stand Monday in his murder trial and apologized to the family of the girlfriend he shot dead, describing himself as traumatized and now on antidepressant medication, and sometimes waking from nightmares to the ''smell of blood.''

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