PRETORIA, South Africa -- Oscar Pistorius refused to look at a photo of his dead girlfriends bloody head wounds while testifying at his murder trial Wednesday as the prosecutor urged the star athlete to "take responsibility" for killing her. Stitched Golden Knights Jerseys . "Its time that you look at it," chief prosecutor Gerrie Nel said, setting the stage for a rigorous first day of cross-examination of Pistorius, the double-amputee Olympian charged with premeditated murder for shooting Reeva Steenkamp three times through a toilet door at his home. "I remember," Pistorius said of Steenkamps bloodied head, becoming distraught and then crying as he turned away from the gruesome image of the injuries he inflicted that were displayed next to him in a packed courtroom in South Africas capital. Nel said Steenkamps head "exploded" when it was struck by one of four hollow-point bullets that Pistorius fired through the door on Feb. 14, 2013 with his 9 mm pistol. The showing of the photograph on TV screens in the courtroom caused gasps among spectators, who included Steenkamps mother, June. The police photo showed a side view of the dead model and reality TV stars head, with a mass of blood and human tissue on the back and upper parts. Her eyes were closed. "I will not look at a picture where Im tormented by what I saw and felt that night," Pistorius said. "As I picked Reeva up, my fingers touched her head. I remember. I dont have to look at a picture, I was there." Pistorius, 27, says he shot Steenkamp in the pre-dawn hours on Valentines Day -- in the head, arm and hip -- by mistake thinking she was a dangerous intruder behind the door in his bathroom about to come out and attack him. Prosecutors charge he killed the 29-year-old intentionally, and Nel aggressively questioned Pistorius for the first time. "You killed her," Nel said. "You shot and killed her," and he asked Pistorius to say it. Pistorius would not, saying merely: "I did." Pistorius faces a possible prison term of 25 years to life if convicted of premeditated murder. Nel also showed a video, first broadcast by Sky News days before the trial started, of the celebrated athlete firing a gun at a watermelon at a shooting range. On the video, Pistorius can be heard saying the melon was "softer than brains" after it explodes when the bullet hits it, and calling the powerful .50-calibre handgun he was using a "zombie stopper." Referring to the watermelon, Nel said to Pistorius: "You know the same happened to Reevas head. It exploded." Defence lawyer Barry Roux objected to the gun video being shown, saying it was inadmissible character evidence and amounted to a legal "ambush" of the defence. After the dramatic start, prosecutor Nel also started to poke holes in details of Pistorius version of the events of the fatal night. The champion runner said that his claim in a court document a year ago that he went out onto a balcony at his home before the shooting was incorrect. Pistorius said he went to the edge of the balcony but not outside. The discrepancy could be significant because Pistorius says he heard a noise in the bathroom that alerted him to a possible intruder, which would have been harder if he was out on the balcony. Nel tried to pin down Pistorius on whether he meant to fire into the toilet cubicle door at a perceived intruder, or whether his gun discharged accidentally. Pistorius said he didnt intend to shoot "anyone" and that he fired "before thinking" because he thought his life was in danger, prompting Nel to accuse him of weighing the legal implications of the question before answering. The dogged prosecutor implied that Pistorius, who grew more agitated, was becoming emotional because he was faced with a difficult question. The judge noted that Pistorius had been emotional throughout the trial. Pistorius told his questioner that he was trying to be careful with his answers because the stakes were high. "My life is on the line," he said. Nel retorted: "Reeva doesnt have a life anymore because of what youve done." And Nel tried to dismantle a sympathetic image of Pistorius that the defence had sought to build up in three days of testimony, asking the athlete to explicitly acknowledge that he killed Steenkamp. "I made a mistake," Pistorius said. "What was your mistake?" Nel shot back. Pistorius then said he "took Reevas life." Nel also questioned the defences portrayal of Pistorius as a good role model. The prosecution depicts him as an angry hothead with a gun obsession. The prosecutor asked Pistorius if people looked up to him as a sporting hero, if he would hide anything and if he lived by Christian principles. "Im here to tell the truth, Im here to tell the truth as much as I can remember," Pistorius said. He also said: "Im human. I have sins." Vegas Golden Knights Shirts . Fielder ended 4-for-5 with a solo homer, while Avila was 4-for-4 with two runs scored for the Tigers, who put the brakes on a three-game skid and rebounded from a loss in Mondays opener. Victor Martinez and Austin Jackson both contributed two hits, an RBI and a run scored as Detroit maintained its healthy lead atop the AL Central. Vegas Golden Knights Pro Shop . - While he appreciates suggestions from Packers fans of remedies for his sore left calf, Aaron Rodgers is not necessarily going to listen to the advice.Phil Clarke looks back on a thrilling weekend of Super League action and picks his five favourite tries. First up are two tries from Thursdays semi-final at the Halliwell Jones Stadium where Warrington defeated St Helens.Jonny Lomax finished off a superb team move which was sparked by a fantastic break and pass by Jordan Turner, but the Wolves had the final say as Tom Lineham crossed in the corner on 64 minutes to clinch their place in the Grand Final. When John Bateman reacted quickest to Matty Smiths charged-down kick and weaved through the Hull defence to slide underneath the posts, Wigan were cruising towards Old Trafford.But Hull FC produced a stirring comeback and took the lead with 17 minutes remaining, and the Warriors had to produce a strong finish to book a fourth successive Grand Final appearance.The drama continued as the KC Lightstream Stadium on Saturday in what was an incrediblle finish to the Million Pound Game. Custom Vegas Golden Knights Jerseys. Trailing 18-10 with time almost up, Salford looked dead and buried but wingers Niall Evalds and Greg Johnson crossed for two tries in as many minutes to force extra-time, and Gareth OBriens stunning long-range drop-goal secured their Super League status. The 2016 Super League season reaches its climax on Saturday when Warrington Wolves face Wigan Warriors in the Grand Final at Old Trafford. Coverage begins on Sky Sports 1 HD at 5pm.You can watch the Super League Grand Final, plus Premier League football and the Japan Grand Prix on Sky Sports. Upgrade now and enjoy three months at half price! Also See: Houghton crowned Man of Steel WATCH: Stevos Grand Final farewell RFL calls ex-Marine Smith Rugby League on Sky ' ' '