The trial of the doctor accused of causing the drug overdose death of pop legend Michael Jackson has been postponed until September. In Los Angeles, lawyers for Dr Conrad Murray had asked for a delay to prepare for new prosecution witnesses. Dr Murray has pleaded not guilty to a charge of involuntary manslaughter in Jackson's June 2009 death at 50. Prosecutors say he gave him a lethal dose of a powerful anaesthetic and then failed to provide proper care. Los Angeles County Superior Court Judge Michael Pastor said he would dismiss the prospective jurors. Prosecutors have said Dr Murray, who had been treating the singer for insomnia, administered the lethal dose of propofol, a drug typically used in a clinical setting, then tried to cover it up. Lawyers for Dr Murray have suggested in recent months that the singer gave himself the lethal dose. Source: BBC