Leaked Pistorius video shot by US firm
US forensic animation and investigation company The Evidence Room produced the footage.
Australia's Channel 7 is scheduled to air a documentary which shows the athlete re-enacting the night he shot and killed Reeva Steenkamp at his upmarket Pretoria East home on Valentine's Day last year.
The 'Blade Runner' says he shot the model by accident, while the state maintains it was a case of premeditated murder.
The Paralympian is also facing two separate firearm-related charges and one for the illegal possession of ammunition.
In the footage, Pistorius carries his sister Aimee out of the toilet and down a flight of stairs to recreate Steenkamp's dying moments.
The athlete screams for the intruders to get out of his house and then for help.
He is also seen walking unaided on his stumps with his right arm up as if carrying a firearm.
He appears far more mobile without his prosthetic legs than his defence team and expert witnesses have led the court to believe.
Eyewitness New s has been unable to obtain comment from Pistorius's legal team, but it's understood they are investigating how the footage was leaked or sold.
They are also asking the Australian broadcaster for clarification on their possession of the footage and their intention to broadcast it.
This latest development raises the question why the video was not shown in court.