Known as the 'Blade Runner' for his carbon-fibre prosthetic legs, Pistorius went from a public hero as a Paralympic champion to a convicted killer in hearings that caught the world's attention.
Pistorius shot and killed Steenkamp on Valentine's Day in 2013.
He was initially jailed for five years in 2014 for culpable homicide by a high court. But the Supreme Court of Appeal in late 2015 found him guilty of the more serious charge of murder after an appeal by prosecutors.
His total sentence was lengthened to six years in 2016, less than half the 15-year minimum term sought by prosecutors.
In 2017, the Supreme Court more than doubled his total sentence to 13 years and five months, saying the six-year jail term was "shockingly lenient."
"Mr. Pistorius will complete the remainder of the sentence in the system of community corrections and will be subjected to supervision in compliance with parole conditions until his sentence expires," the Department of Correctional Services said in a statement on Friday.
Lawyers for Pistorius and the Steenkamp family did not immediately respond to requests for comments.
Ahead of the hearing earlier in the day, Rob Matthews, spokesperson for Steenkamp's mother June, read out a statement from her detailing the impact the murder had had on the family.
"I'm not convinced that Oscar has been rehabilitated. Rehabilitation requires someone to engage honestly with the full truth of his crime and the consequences thereof," June Steenkamp said in the remarks read out by Matthews.
Several factors are typically taken into account by a parole board, including the nature of the crime, the possibility of reoffending, conduct in prison, physical and mental wellbeing and potential threats a prisoner may face if released.
Pistorius was denied parole in March after it was ruled that he had not completed the minimum detention period required to be considered for parole.
However, the Constitutional Court said in October that Pistorius had served half of his sentence by March 21, which meant he was eligible, after his sentence was backdated to July 2016 instead of November 2017.
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