On Nov. 24, the court of appeal agreed with prosecutors and more than doubled Pistorius' prison sentence to 15 total years.
Pistorius should have been sentenced to the prescribed minimum of 15 years for murder in South Africa, Seriti said, as he delivered the verdict that was reached by a panel of five judges at the Supreme Court in the central city of Bloemfontein.
The Blade Runner shot and killed his girlfriend, Reeva Steenkamp, at his home on Valentine's Day 2013. Claiming he mistook his girlfriend for an intruder, he was initially convicted of manslaughter.
The conviction was later overturned and a murder conviction was set in place in 2015. "They just feel that their trust in the justice system has been confirmed this morning", Tania Koen, a spokeswoman for the Steenkamp family, told Reuters.
Judge Thokozile Masipa ruled the state failed to prove beyond reasonable doubt that Pistorius was guilty of premeditated murder, but may still be guilty of culpable homicide - equivalent to the United Kingdom law of manslaughter.
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The Supreme Court said that Pistorius "displays a lack of remorse, and does not appreciate the gravity of his actions". The court agreed and the sentence is now 13 years.
Technically, Pistorius should be eligible for parole after serving half of his jail term.
But even though State prosecutors managed to get it upgraded to murder, only one extra year was added to the sentence.
Pistorius, who turned 31 on Wednesday, is being held at the Atteridgeville Correctional Centre on the outskirts of the South African capital, Pretoria, and did not attend any of the appeal hearings.
Barry Roux, lead defence lawyer for Pistorius, said the athlete was suffering from severe and worsening post-traumatic stress disorder over the case.