Oscar Pistorius has been cleared of all murder charges in the 2013 killing of Reeva Steenkamp.

Judge Thokozile Masipa ruled out Oscar's actions as premeditated, and said he could not be found guilty on the lesser charge of murder either.

The paralympian wept and shook as Masipa spoke to the court.

"Clearly he did not subjectively foresee this as a possibility that he would kill the person behind the door, let alone the deceased as he thought she was in the bedroom,'' she said. "That, however, is not the end of the matter."

Masipa is still considering the notion of "culpable homicide", comparable to a manslaughter charge in the U.S. She agrees Oscar's behavior was inexplicable and is "not convinced that a reasonable person" would have fired multiple shots into the bathroom and not thought the person inside could be killed.

"In the circumstances, it is clear that his conduct was negligent," said Masipa.

Earlier she criticized the testimony of witnesses, saying they were possibly tainted by the immense media coverage of the case. A charge of culpable homicide could mean a sentence of up to 15 years in prison for Pistorius, while the firearms-related charges could carry five years on top of that.

The verdict will continue on Friday.