Forensic expert: Pistorius is innocent
Scott Roder says a study of the physical evidence shows the athlete is not guilty.
An interview with the director of American forensic animation and investigation company, The Evidence Room, as well as Steenkamp's friends and family are included in the documentary which aired in Australia yesterday.
The 'Blade Runner' says he shot the model by accident, while the state maintains it was a case of premeditated murder.
Evidence room chief executive Scott Roder says Pistorius's story has remained unchanged and a study of the physical evidence shows that he is not guilty.
Roder and his team from Ohio were hired in October last year to visually map the events of the morning Pistorius killed Steenkamp.
He said in the documentary that his reconstruction and video material were provided to the Pistorius family and defence team.
It included Pistorius walking on his stumps and screaming.
The athlete's attorney Brian Webber said the video was recorded solely for the purposes of trial preparation.
He has slammed its release as a breach of a non-disclosure agreement and added that Channel 7 in Australia bought it illegally.
The footage shows the athlete briskly walking unaided on his stumps while pretending to hold a firearm and screaming as he did on the morning he killed Steenkamp.
The athlete's sister plays the role of Steenkamp, as she is picked up from a bathroom floor and carried down a flight of stairs.
Pistorius remains calm throughput the re-enactment, in stark contrast to his emotional episodes in court at the mere mention of this sequence of events.
The documentary includes interviews with Steenkamp's friends and family, who say the couple fought a lot in the weeks before the shooting.
At the same time, the athlete's family has described the release of the footage as a staggering breach of trust and an invasion of their privacy.
State prosecutor Gerrie Nel will continue cross-examining Professor Wayne Derman today.
Derman has testified that Pistorius was unable to run on his stumps and felt vulnerable due to his disability on the day he shot and killed Steenkamp.
Derman has testified that Pistorius had no choice but to go into "fight" mode because he couldn't run on his stumps and flee when he thought his life was in danger.
Nel has consulted a state psychiatrist to formulate more questions for Derman who has made several assumptions about Pistorius's state of mind on the day he killed Steenkamp.
Derman maintains that as a disabled person, Pistorius went into "fight or flight" mode when he heard a noise in the bathroom because he was on his stumps and chose to approach the perceived danger instead of fleeing.
He, however, said this was backed up by scientific evidence.
Nel will ask more questions today about Pistorius's hyper-vigilant state and whether this can be attributed only to his disability.