 (CNN) After serving 10 months for shooting his girlfriend to death, Paralympic runner Oscar Pistorius is expected to be freed from prison in South Africa and go into house arrest Friday. Pistorius was once considered one of the ultimate symbols of triumph over adversity, fighting authorities to become the first amputee to compete against able-bodied athletes at the Olympics. Image caption Pistorius' girlfriend Reeva Steenkamp was a lawyer, model and TV star 
 
 Pistorius was born without the fibulas in both of his legs, and had surgery to amputate both below the knee while still a baby. He was convicted of culpable homicide -- killing her unintentionally but unlawfully -- after he said he mistook her for an intruder.  Image caption The trial of the Olympic athlete drew worldwide media attention 
 
 Prosecutors in South Africa have filed papers calling for Oscar Pistorius to be convicted of murder, days before he is due to be released on probation. Pistorius, 29, is expected to wear an electronic tracking tag when he is released on Friday after serving 10 months of a five-year sentence for killing his model and law graduate girlfriend Reeva Steenkamp on Valentine's Day 2013. But legal experts say Pistorius' early release was a virtual certainty from the day he was sentenced. The release of Pistorius, whose lower legs were amputated when he was a baby, is in line with South African sentencing guidelines that say non-dangerous prisoners should spend only one-sixth of a custodial sentence behind bars. PRETORIA In one of the wealthiest suburbs of South Africa's capital Pretoria stands a three-storey mansion where Paralympic gold medalist Oscar Pistorius will be taken on his release from prison this week. Pistorius has admitted killing Steenkamp, 29, by firing four shots into the locked door of a toilet cubicle in what he said was the mistaken belief that an intruder was hiding behind it. Hide Caption 8 of 8 
 
 Reeva Steenkamp's parents submitted a letter urging the parole board not to release him early. They said at the time of Pistorius' sentencing that spending 10 months in prison "for taking a life is simply not enough" and it would send out the wrong message to society. The National Prosecuting Authority presents its written arguments Monday to the Supreme Court of Appeals in Bloemfontein. Prosecutors want the verdict of culpable homicide, equivalent to manslaughter, raised to murder because they argue Pistorius must have known when he fired that the person behind the door could be killed. The state's appeal is set to take place in November. Hide Caption 54 of 54 
 
 The state's appeal is based on a question of law -- specifically: Did Judge Thokozile Masipa correctly interpret the principle of dolus eventualis, or intent to kill in regard to the evidence presented during trial?
– After serving 10 months of a five-year sentence for killing girlfriend Reeva Steenkamp, Oscar Pistorius is about to start doing time in his uncle Arnold's house, which Reuters reports has "more than a dozen bedrooms, a private gym, outdoor swimming pool, and landscaped garden." Prisons are overcrowded in South Africa, and prisoners are routinely released a sixth of the way into their sentences. Pistorius will have to wear an electronic tag as he serves the rest of his time on "corrective supervision" in the luxury home. "It's more like mansion arrest," a security guard on the uncle's street in a Pretoria suburb tells Reuters. Pistorius is expected to leave prison Friday and will be able to leave his uncle's house to work. He apparently plans to work with disadvantaged children and is unlikely to run competitively anytime soon: CNN reports that the International Paralympic Committee has banned him from competing until after his full sentence expires, meaning the next Olympics he can take part in will be in 2020, when he will be 33 years old. His future may also hold more time in prison. Prosecutors filed papers yesterday to have Pistorius' culpable homicide conviction in Steenkamp's death converted to a murder conviction, which carries a minimum 15-year sentence, reports the BBC.