Oscar Pistorius has buried his head in his lap during a graphic account of how bullets he fired fatally injured his girlfriend.

Forensic expert Roger Dixon, who has suggested neighbours who gave evidence for the prosecution were mistaken in what they heard, is giving further evidence on day 24 of the trial.

Pistorius lowered his head and clasped his hands around his ears as Mr. Dixon provided details of the injuries caused to Reeva Steenkamp's body by the bullets he fired.

The witness used a photograph placed on the back of a junior member of the defendant's legal team to illustrate where the Black Talon bullets hit his girlfriend's back.

The court also heard how the bullets and fragments damaged her skull after passing through the toilet door in the Paralympian's home.

Mr. Dixon appeared to dispute the prosecution's account - suggesting that if Ms. Steenkamp had been facing the door the shape of the bullet wounds would have been different. Ms. Steenkamp's mother June, her agent and friends of the model were in court to hear the graphic evidence.

Prosecutor Gerrie Nel challenged Mr. Dixon's expertise - pointing out that he was not currently registered with any forensic body.

The witness admitted that he had no idea about the sound expertise of a person who made a recording of a gun being fired, which has used as evidence.

He has also being accused of dodging questions about his handling of evidence from the crime scene.

The athlete's lawyers have about a dozen witnesses to call as they try to challenge the State's charge that he shot his girlfriend, Reeva Steenkamp, deliberately.

Earlier, Judge Thokozile Masipa ruled that proceedings will adjourn for more than two weeks on April 17th and resume on May 5th.

Pistorius (27) admits shooting his girlfriend - but says he believed that she was an intruder.

He denies premeditated murder and illegally possessing ammunition. He also denies two further counts related to shooting a gun in public on separate occasions prior to the killing.