Prosecutor Gerrie Nel questions Wayne Derman, a sports physician, in the North Gauteng High Court in Pretoria on July 3, 2014. Picture: Herman Verwey

Johannesburg -

Cross-examination of a sports and exercise medicine professor who treated Oscar Pistorius is expected to continue in the North Gauteng High Court in Pretoria on Monday.

On Thursday, prosecutor Gerrie Nel accused University of Cape Town professor Wayne Derman of bias and adapting his facts to fit what happened in the early morning of February 14, 2013, when Pistorius shot and killed his girlfriend, Reeva Steenkamp, in his Pretoria home.

Pistorius faces a murder charge. He claims he shot Steenkamp by accident through the locked door of his toilet in his home, thinking she was an intruder about to emerge and attack him.

The State argues he killed her during an argument.

On Saturday, Pistorius's lawyers said they were taking legal action against an Australian media house that broadcast footage of him re-enacting the night he shot Steenkamp.

The trailer for the Australian current affairs programme Sunday Night shows Pistorius walking rapidly on his stumps with an imaginary gun in his hand. In another scene, Pistorius carries a woman, reportedly his sister Aimee, out of his bathroom to show how he carried Steenkamp.

According to the current affairs show's website, the video was “never-before-seen footage of Oscar Pistorius re-enacting the night he killed Reeva that convinced a top forensic expert he is innocent”.

Pistorius's family spokeswoman Anneliese Burgess said they had “asked for urgent clarification from Channel 7 in Australia”. - Sapa