ROUGH CUT - NO REPORTER NARRATION<br /> <br />"Blade Runner" Oscar Pistorius pleaded not guilty on Monday (March 3) to murdering his girlfriend at the start of a trial with massive media cover that could see one of global sports' most admired role models go to jail for life.<br /> <br />When asked how he would plead to the charges of the "unlawful and intentional killing" of 29-year-old model Reeva Steenkamp on Valentine's Day last year, a sombre-looking Pistorius told judge Thokozile Masipa: "Not guilty, my lady."<br /> <br />Dressed in a dark suit, white shirt and black tie, the Paralympic and Olympic runner also pleaded not guilty to several other firearms charges, including once discharging a pistol under the table of an upmarket Johannesburg restaurant.<br /> <br />The 27-year-old, who was born without legs but reached the 2012 Olympic 400 metres semi-final running on carbon-fibre "blades", argues that the killing of law graduate Steenkamp was a tragic case of mistaken identity.<br /> <br />He says he mistook
