South African athlete Oscar Pistorius has returned to court for the first time since he was freed on bail over the killing of his girlfriend.The pre-trial hearing was brief, with the prosecution and defence seeking a postponement until August.Mr Pistorius shot Reeva Steenkamp through the bathroom door of his house in Pretoria on 14 February.He denies committing murder, saying he was acting in self-defence after mistaking her for an intruder.The case is unlikely to come to a full trial until early next year, the BBC's Andrew Harding reports from South Africa.'Disgusted'Tuesday's hearing at Pretoria Magistrates Court was attended by Mr Pistorius's sister and brother as well as other family and friends.The athlete wore a grey suit and appeared composed in the face of dozens of clicking cameras, witnesses said.The prosecution asked for the hearing to be postponed until 19 August saying it needed "time for further investigation". The prosecutor said the date had been agreed by the defence team.The magistrate agreed to the date but queried why both the defence and prosecution had asked not to reveal the details of their agreement over the postponement.Mr Pistorius spoke only once, confirming "Yes, Your Honour" when asked if he understood the magistrate's comments.On Monday, Mr Pistorius's family said they were "shaken" by leaked, graphic photos published by Sky News, which showed the bathroom where 29-year-old Reeva Steenkamp was killed.Police said they were "disgusted" by the leak.Mr Pistorius, 26, is a double amputee who won gold at the London 2012 Paralympic Games and also competed in the Olympics.His arrest in February stunned many South Africans who saw him as a national sporting hero after his long legal battle to be able to compete in the Olympics.The prosecution has accused him of premeditated murder, alleging that he killed Ms Steenkamp intentionally after a fight.Mr Pistorius was freed on a bail of 1 million rand (£74,000; $110,000). A court in March eased his travel restrictions, allowing him to leave South Africa to compete as long as he complied with certain conditions.