Last month the double-amputee runner was found guilty of culpable homicide, or negligent killing.
Sentences for such a crime can range from a suspended sentence and a fine to as many as 15 years in prison.
Pistorius, once a celebrated athlete who ran in the 2012 Olympics, was charged with premeditated murder in a televised trial that transfixed many people around the world, but judge Thokozile Masipa found him not guilty of that charge.
She drew criticism from some South Africans who thought Pistorius could at least have been convicted of a lesser murder charge on the grounds that he knew a person could die when he fired four bullets through a toilet door in his home early on Valentine's Day last year.
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Steenkamp, a 29-year-old model, died in the hail of bullets, and prosecutors said Pistorius had opened fire in anger after the couple argued. The runner testified that he mistook Steenkamp for an intruder who was about to come out of the toilet and attack him.
Prosecutor Gerrie Nel is urging judge Masipa to send Pistorius to prison for at least ten years and for him never to be allowed to own a firearm again.
The sentencing options available to Judge Masipa including a 15 year prison sentence, a suspended jail sentence and a fine or to order the 27-year-old Paralympic champion to go under house arrest.
Pistorious’s lawyers have argued for a three-year sentence of occasional house arrest and community service with no jail time.
They claim he has suffered emotionally and financially already and would be vulnerable in prison because of his disability as a double amputee.
They also say an incarcerated gang leader has alleged Pistorius would be under threat if he’s jailed.
However Zach Modise, the acting national commissioner for correctional services, has insisted South Africa’s prison system can accommodate him and that Pistorius would likely be housed in the hospital section of a Pretoria jail. He also said he was unaware of any alleged threats made against the athlete.