"The sentence imposed... in respect of murder is set aside and substituted with the following: the respondent is sentenced to imprisonment for a period of 13 years and five months", the judge said, reading out the court's decision. Prosecutors argued that the initial sentence was "shockingly light" compared to the country's minimum 15-year-sentence for murder.
Pistorius explained that he had not fired a warning shot as he thought he might be harmed if the bullet ricocheted.
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.
Pistorius, who had both of his legs amputated below the knee before he was 12 months of age, represented South Africa at the Paralympics, winning six gold medals, and Olympics. An appeals court changed that verdict to murder in December 2015, according to the BBC.More news: Jurgen Klopp: 'Mohamed Salah has nothing to prove to Chelsea'
"They have sent all their love to the Ings family because they feel that although justice was serviced for Jayde, they know the Ings family will still miss Jayde every day".
The Supreme Court said that Pistorius "displays a lack of remorse, and does not appreciate the gravity of his actions". "After the trial‚ he tried to make contact‚" Roux said.
Technically, Pistorius should be eligible for parole after serving half of his jail term.
Pistorius failed with an appeal to the Constitutional Court previous year to challenge his murder conviction.