Doctors conducted an autopsy on the body of Michael Jackson on Friday but could not immediately determine what killed the “King of Pop,” amid reports he had been injected with a narcotic painkiller shortly before collapsing. “The cause of death (determination) has been deferred, which means that the medical examiner has ordered additional testing such as toxicology and other studies,” Los Angeles County Coroner's spokesman Craig Harvey said. “Those tests we anticipate will take an additional four to six weeks.” Most of Michael Jackson's family members have gathered in their Encino compound where they are contemplating funeral arrangements, caring for his three children and feeling confused, upset and angry by the lack of information about those who were around the pop superstar in his final days, a person close to the family said. Jackson's family wants to know more specifics about what role AEG, the concert promoter that was staging his 50-date concert series at London's 02 Arena, was playing in his life, said the person, who requested anonymity because of the delicate nature of the situation. They also want to know more about the role of his advisers and representatives, who they believe were put in place by the promoter. Randy Phillips, AEG Live president and chief executive, said earlier Friday that it was Jackson who insisted that Dr. Conrad Murray, a financially troubled cardiologist who was with the entertainer when he collapsed Thursday, be put on the tour payroll. Jackson never communicated to his family who he had in place to handle his business affairs, the person close to the family said, adding that they were told by the singer's phalanx of advisers that the singer likely had a will, but it may be many years old. The family is distrustful of what they are being told, but they are determined to find out more, the person said. The autopsy concluded that there were no signs of foul play or trauma, but determining the cause of death will require further tests that will take six to eight weeks.