Oscar Pistorius Oscar Pistorius

A South African judge found Olympic track star Oscar Pistorius not guilty of murder or premeditated murder in the death of his girlfriend, Reeva Steenkamp, on Thursday.

Pistorius, 27, could still be found guilty of culpable homicide, which means he acted negligently in Steenkamp's death, and could still serve jail time. The case was adjourned until Friday morning.

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Judge Thokozile Masipa said the Paralympian had been "negligent" and "acted too hastily," but there was not enough evidence to prove that Steenkamp's killing was planned or intentional on the part of Pistorius — a double amputee nicknamed "Blade Runner" because of his prosthetics.

On Valentine's Day 2013, Pistorius fatally shot Steenkamp, 29, four times. Prosecutors said Pistorius and Steenkamp's neighbors heard the couple arguing before her death, but Pistorius has maintained that he thought she was a burglar and that her death was accidental.

Had he been convicted of premeditated murder, Pistorius would've faced 25 years to life in prison.