Olympic and Paralympic track star Oscar Pistorius is pictured ahead of his sentencing hearing at the North Gauteng High Court in Pretoria in this October 16, 2014 file photo. [Photo/Agencies]

JOHANNESBURG - Oscar Pistorius, South Africa's "Blade Runner", was released on parole on Monday, just short of a year into his five-year sentence for killing his girlfriend Reeva Steenkamp.

But the disgraced Paralympic gold medallist must serve the rest of his sentence under house arrest, and still has to face an appeal by prosecutors who argue that he should have been convicted of murder rather than culpable homicide.

Pistorius, 28, who was found guilty of the lesser charge when he fired four shots through a locked bathroom door and hit Steenkamp, will be confined to his uncle Arnold's home in a wealthy suburb of the capital Pretoria.

The athlete, whose lower legs were amputated when he was a baby, will be freed in line with South African sentencing guidelines that say non-dangerous prisoners should spend only one-sixth of a custodial sentence behind bars.

The department of correctional services said Pistorius' parole conditions include that the gun enthusiast must undergo psychotherapy and is not allowed to possess a gun.

Africa's most advanced economy has one of the world's highest rates of violent crime.

"He might not have been found guilty of murder, but it was yet another instance of a South African woman killed by an intimate partner, and I don't believe the time he spent in prison reflects the severity either of his crime or the epidemic of violence against women," said Louise Ferreira, a feminist.