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South African prosecutors have started an appeal hearing on whether athlete Oscar Pistorius should be convicted of murder instead of culpable homicide.
The Paralympian was released from prison last month after serving one year of his five-year term for killing his girlfriend Reeva Steenkamp.
Pistorius, 28, shot her through a locked bathroom door in 2013 but insists he thought she was an intruder.
He could be sent back to jail if appeal judges overturn the original verdict.
Pistorius is currently under house arrest, and is not attending the hearing at South Africa’s Supreme Court of Appeal in Bloemfontein.
The proceedings are being broadcast live on television.
State prosecutor Gerrie Nel has been outlining the state’s case for the verdict to be changed to murder from culpable homicide or manslaughter.
It is not the facts that five appeal court judges will have to consider but the application of the law, in what is expected to be a highly technical case, the BBC’s Karen Allen in Bloemfontein reports.
The prosecution says that Judge Thokozile Masipa incorrectly applied the law of murder – or dolus eventualis – and argues that Oscar Pistorius should have foreseen the result of his actions, namely that shooting four times through a closed bathroom door would result in a person’s death, our correspondent says.
The athlete said he believed there was an intruder in the house and thought his girlfriend was in the bedroom.
The prosecution will argue that who was behind the bathroom door is irrelevant, and Pistorius’s intent was to kill, our correspondent adds.
Pistorius was found guilty of culpable homicide, or manslaughter, of his 29-year-old girlfriend at a trial in October last year.
Ms Steenkamp’s relatives have said they think Pistorius is “getting off lightly”.
The double amputee was released from prison on 19 October. Under South African law, he was eligible for release under “correctional supervision” having served a sixth of his sentence.
His family said he would “strictly” adhere to his parole conditions at his uncle’s upmarket home in Pretoria.
Pistorius competed in the 400 metres at the London 2012 Olympics, wearing carbon-fibre blades to run against able-bodied athletes.
