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Oscar Pistorius took the witness stand in his own defence on Monday telling a South African court how the death of his girlfriend has left him terrified and sleepless.The 27 year old Olympic and Paralympic star, testified that he had been on anti-depressants and sleeping pills because of his disturbed state of mind. The distraught figure in the witness stand was a far cry from the gun-obsessed, fast-living hot-head that prosecutors sought to portray during the first 16 days of the trial. His defence hinges on his assertion that he mistook Steenkamp for an intruder hiding in the toilet when he shot her on Valentine’s Day last year.