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Nel: Expert witness blatantly biased

Professor Wayne Derman has come under intense cross-examination in the Oscar Pistorius murder trial.

State prosecutor Gerrie Nel during the Oscar Pistorius murder trial. Picture: Pool.

JOHANNESBURG - State prosecutor Gerrie Nel on Thursday attempted to cast doubt over the objectivity of the defence's latest expert witness by accusing him of blatant bias.

Professor Wayne Derman has come under intense cross-examination in the North Gauteng High Court in Pretoria.

The 27-year-old Olympic and Paralympic athlete, Oscar Pistorius, is accused of murdering his girlfriend Reeva Steenkamp at his upmarket Pretoria East home on Valentine's Day last year.

Pistorius maintains he shot the model by accident while the state believes the incident is premeditated murder.

In his testimony, Derman described having treated Pistorius as the Paralympic team doctor and in his personal capacity.

He says in the six years of treating Pistorius, he became intimately familiar with the athlete.

Derman said he was therefore able to testify that the athlete was anxious and hyper vigilant.

This caused Nel to put the professor's objectivity into question.

"You have to always act in the best interest of your patient. You cannot give evidence against your patient, sir."

The matter has been postponed to 7 July.