Oscar Pistorius will be released from prison Oct. 20.
"He's found guilty of culpable homicide," Judge Thokozile Masipa said.
Pistorius will go from prison to house arrest.
In September 2014, Pistorius was found guilty of culpable homicide: essentially the unintentional, unlawful killing of a person.
Pistorius shot and killed his girlfriend Reeva Steenkamp on Valentine's Day 2013.
He says he thought she was an intruder.
Chief prosecutor Gerrie Nel asked, "What did you think at the time, Mr. Pistorius?"
"That's the moment that everything changed. I thought that there was a burglar that was gaining entry into my home," Pistorius said.
The Paralympian was supposed to be released for house arrest in August, but the decision was appealed.
He has served just one year of his five-year sentence. (Video via China Central Television)
South African prisons are notoriously overcrowded, which often leads to reduced sentences or early releases.
Pistorius will reportedly serve the rest of his sentence at his uncle's house outside of Pretoria, South Africa.
This video includes images from Getty Images.