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Oscar Pistorius: Abusive Boyfriend, Fallen Hero? (Slideshow)

By Candace Dempsey, author of Murder in Italy, the true story of Amanda Knox. 

Who's famed South African sprinter Oscar "Blade Runner" Pistorius really? Did the Olympic athlete shoot girlfriend Reeva Steenkamp because he mistook her for an intruder, right before Valentine's Day? Did that gun just go off 4 times? African psychologist Leonard L. Carr's trial tweets illuminate Oscar's week on the stand.