A young man reportedly tried to capture a selfie with Oscar Pistorius while in court for the Paralympic champion's murder trial.

The youngster, who was accompanying an advocate, entered the courtroom in Pretoria on day four of the trial in which Pistorius is accused of murdering his girlfriend Reeva Steenkamp.

According to Eyewitness News reporter Barry Bateman, the young man tried to get a snap of the accused during a break in proceedings but was asked to stop, and then left with his advocate father.

Pistorius, who sobbed while an eighth witness gave evidence today, has denied murdering the South African model.

The sportsman has maintained that he mistook Steenkamp for an intruder when he fired gunshots through a bathroom door in his home in Pretoria on Valentine's Day last year.