Johannesburg - The case against three suspects who allegedly shot Carte Blanche producer Johann Botha and his friend during a robbery in Johannesburg has been postponed pending further investigation.Nkosiyazi Phungula, 27, Ntobeko Hlatswayo, 32 and Thembi Masethembe Mbatha, 19, briefly appeared in the Johannesburg Magistrate's Court on Friday on charges of murder and robbery. Magistrate Lucas van der Schyff said the case would be postponed until September 12. All three suspects would remain in custody until then, the court heard. The suspects did not apply for bail at their previous court appearance on July 9.The three were arrested in Melville, Johannesburg, on June 14, a week after Botha and his friend, Werner "Swazi" Perchtold, were shot during an armed robbery.The two were shot at the Zebra Inn restaurant in Maboneng, Johannesburg, when the suspects entered the bar and restaurant on the evening of June 7, pretending to be customers. Perchtold is the owner of Zebra Inn, a popular place in the area, boasting Swazi's numerous achievements in hunting and athletics among others. "The suspects bought something to drink and a while later they pointed their firearms [at] the two victims and shot them dead," Gauteng Police spokesperson Captain Kay Makhubela told News24 previously. The suspects allegedly made off with some firearms and an undisclosed amount of money.