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People.com is reporting that the Jackson family was so concerned with Michael's use of pills and alcohol that they staged an intervention in 2006.
"The family believes Michael is addicted," a family insider said. "There was an intervention in Las Vegas. Janet was on the phone, but Randy, Jackie and Rebbie were there in person."
"Michael got pissed off. He said he wasn't on drugs. But they didn't believe him."
During the intervention, the family blamed a Jackson aide for getting the drugs for Michael, from prescriptions acquired from multiple doctors.
"[The aide] has contacts wherever they are," said the source. Revealing that, in addition to drinking, Michael would take "straight morphine, Demerol and opiates like Oxycontin. He also takes Valium and Xanax."
"Michael is a clinically functioning addict and these are the most dangerous," the source continued. "They stop and start. These are the ones that OD ... It could happen any minute."
The autopsy is scheduled for today, but it could take weeks for toxicology reports to come back.