La Toya has already informed the authorities of who she believes is responsible and she has promised to reveal the culprits to the world.

'If justice is not served in the courts, I will name them myself. I have made it clear to the police who is responsible. They must ensure, for Michael's sake, that the outcome is right,' she said.

After autopsy reports showed that the King of Pop died from an overdose of heavy-duty painkiller Diprivan, police may also bring a charge of murder.

Police have told Jackson's family that they will press charges against one or more people within a few days and that there will be a criminal trial.

The development was revealed in an interview by Terry Harvey, a long-time friend of the Jackson family.

'The autopsy shows that Michael died of a drug overdose with Diprivan and a range of pills in his stomach. He had needle marks on his neck and all over his body. The authorities have told the family the Drug Enforcement Administration (DEA) are pushing for a criminal charge,' said Harvey.

'It is likely to be second-degree murder, due to the actions which led to his death. They have been assured that someone, or maybe more than one person, will be brought to trial. The family is working with the DEA and Los Angeles Police Department to work out which doctor prescribed Michael these drugs and how far back this serious problem runs,' he added.

Jackson's personal doctor Murray, who has been questioned twice by police, is reported to be in Houston, Texas, where he has a medical practice.

Murray's lawyer Ed Chernoff said: 'Dr. Murray didn't administer anything that should have killed Jackson.'