The family of Oscar Pistorius say a video - in which the athlete re-enacts the night he shot dead his girlfriend, Reeva Steenkamp - was obtained by an Australian TV channel illegally.
In it, the athlete is seen moving quickly without his prosthetic legs.
His defence team are said to be angry that the footage - which they decided not to use in court - has emerged.
They have argued he is unable to move quickly on his stumps.
Pistorius denies murder, claiming he mistook Reeva for an intruder.
