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Oscar Pistorius will find out later if he has to go back to prison when the Supreme Court announces if his conviction has been changed from manslaughter to murder.
The runner is currently under house arrest at his uncle's luxurious home in Pretoria after serving less than a year in prison for killing his girlfriend on Valentine's Day 2013.
State prosecutors want an appeal court panel of five judges to set aside his original conviction and instead rule that he murdered Reeva Steenkamp.
A murder conviction carries a much heftier sentence: a minimum of 15 years in jail in South Africa.
The state argued the trial judge misinterpreted the law of dolus eventualis - a Latin legal phrase meaning the act was carried out by the accused knowing it would lead to death and the accused went through with it anyway.
The prosecutors also said the judge wrongly applied the strict questions of law, and then answered them wrongly.
The panel can order a retrial; it can dismiss the appeal or it can overturn the original verdict and impose the more serious murder one as well as change the sentence.
Pistorius' lawyers have argued that the trial judge was correct in her analysis and that the prosecutors were effectively trying to force through a mini retrial by pushing points already dismissed in the original court case.