Pistorius is now set to go back to jail after he was released on parole in October having served one year of his five-year sentence for culpable homicide - the equivalent of manslaughter. "Guilty of murder, with the accused having criminal intent," judge Eric Leach told the court in a dramatic legal reversal. "The matter is referred back to the trial court to consider an appropriate sentence."

The 29-year-old star Paralympic sprinter shot dead Reeva Steenkamp, a model and law graduate, in the early hours of Valentine's Day two years ago. He said during his trial that he mistook her for an intruder when he opened fire at the locked door of his bedroom toilet.

"He did not know whether that person constituted any threat," Leach said in a damning rejection of the testimony from Pistorius and the original trial judge's ruling. "It is inconceivable that a rational person thought he was entitled to fire at this person with a heavy-duty firearm," said Leach, who described Pistorius's testimony as "vacillating and untruthful".

"He must have foreseen that the person behind the door might be injured. "He ought to have been convicted not of culpable homicide... but of culpable murder."

Pistorius, who was not be present in court in Bloemfontein, South Africa's judicial capital, now faces a minimum of 15 years in prison for murder. Awaiting his new sentence, he is likely to remain under house arrest at his uncle's mansion in the capital Pretoria.

His trial attracted worldwide attention as he denied killing Steenkamp in a rage after the couple had gone to bed. "I was overcome with fear," he said while in the dock, describing how he thought he heard an intruder in the bathroom.

He grabbed his gun, and rushed without his prostheses to the bathroom. "Before I knew it, I'd fired four shots at the door," he said, adding that he ran back to the bed only to find that Steenkamp was not there.

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