The Supreme Court of Appeal (SCA) increased the sentence of former Paralympian Oscar Pistorius, to 13 years and five months in prison for the 2013 murder of his girlfriend Reeva Steenkamp.
The world-renowned athlete was arrested on Valentine's Day in 2013 - the day of the killing.
The court upheld an appeal by prosecutors, who challenged the original six-year sentence for being too lenient over the shooting.
He claimed that he had mistaken Steenkamp for an intruder.
The court handed down the minimum 15-year sentence prescribed for murder in South Africa, subtracting the year Pistorius has already served.
Camera IconOscar Pistorius reacts in the Pretoria High Court on September 11, 2014, in Pretoria, South Africa.
Previously a role model for disabled people worldwide, Pistorius was released from jail in 2015 after serving one year of a five-year term for culpable homicide - the equivalent of manslaughter.
"The sentence should reflect the gravity of the crime", she said at the time.
The prosecution argued that Pistorius' disability should not have been a mitigating factor and that the athlete, who wept regularly throughout the trial, had not shown genuine remorse, but rather felt sorry for himself and regretted his actions.
There was no immediate comment from the Pistorius or Steenkamp families.