South Africa's former Olympic runner Oscar Pistorius is set to be released from prison on parole Friday, almost 11 years after he shot dead his girlfriend, Reeva Steenkamp.

Having served more than half his sentence, Pistorius will leave the Atteridgeville prison on the capital's outskirts, Pretoria.

Authorities have withheld the timing and logistical details, citing "security" concerns.

As a condition of his release, Pistorius—referred to as "Blade Runner" globally—will not be permitted to speak to the media.

Prison officials have informed the press that they cannot take his picture.

In the wee hours of Valentine's Day 2013, Pistorius shot and killed 29-year-old Steenkamp, a model, by firing four times through the toilet door of his highly guarded Pretoria home.

The shooting occurred one year after Pistorius made history at the London 2012 Olympics by becoming the first double amputee to compete in an Olympic race.

He was found guilty of murder and given a 13-year jail sentence in 2017 after a lengthy trial and several appeals.

He had pleaded not guilty and denied killing Steenkamp in a rage, saying he mistook her for a burglar.

Steenkamp's mother has said she did not believe he had told the truth about what happened.

"My dear child screamed for her life loud enough for the neighbours to hear her. I do not know what gave rise to his choice to shoot through a closed door," June Steenkamp had said.

After serving half of their sentence, offenders in South Africa are automatically eligible for parole consideration.

When the board discovered Pistorius had not served the minimum time in custody before being released, Pistorius lost his initial bid in March.

That was an error, the Constitutional Court declared in October, opening the door for a hearing in November that authorized his release.

Pistorius is required to attend anger management and gender-based violence treatment sessions as part of his parole, which runs until the end of his term in 2029.

In addition, he'll have to perform community service, be home at specific hours, and refrain from using alcohol or other drugs.