The world must wait to find out what stopped Michael Jackson’s heart beating.An autopsy on his body has failed to identify the exact cause of his death on Thursday. It may be six weeks until further tests can end growing speculation over what led to the star’s cardiac arrest at his home. A coroner’s spokesman told reporters in Los Angeles: “The cause of death has been deferred, which means that the medical examiner has ordered additional testing, such as toxicology and other studies. Those tests we anticipate will take approximately four to six additional weeks to complete.” Some media reports claim Jackson had taken a cocktail of prescription painkillers, sedatives and anti-depressants. His personal doctor was with him when he collapsed and police are keen to speak to him again, although they insist he is not a criminal suspect. “We will do a thorough interview with the doctor to discuss some of the unanswered questions that have been raised by the death of Michael Jackson and we expect that the doctor will be able to shed some light on some things that when viewed with conjunctions coroner’s findings will lead us to some conclusions,” said a police spokesperson. Jackson’s family has been allowed to collect his body, but there is no word yet on funeral arrangements. In the meantime, fans continue to pay tribute at the star’s home and the family home in California.