Michael Jackson Autopsy Results: Coroner Reports Cause of Death Unknown, Foul Play Not Suspected

The Los Angeles County Coroner says Michael Jackson's autopsy is complete, but more testing is needed before the official cause of death can be determined.

The coroner said the cause of Michael Jackson's death Thursday was deferred because additional testing - including toxicology and other tests - is needed.

That will take 4-6 weeks to complete.

There was no trauma to Michael Jackson's body and "no indication of foul play" - but he said the superstar had been taking "some prescription medications."

It has been theorized - though not confirmed - that a Demerol overdose may have played a role in his demise by slowing Jackson's breathing until it stopped.

While the singer pronounced dead in the emergency room of UCLA, evidence suggests he was not breathing or conscious at the time a 911 call was placed.

Attempts by Dr. Conrad Murray (left) to revive Michael Jackson were unsuccessful after he suffered cardiac arrest. Michael Jackson's official cause of death is still unknown.

His personal physician, Dr. Conrad Robert Murray (pictured) was presumably the last person to see him alive, performing CPR before paramedics arrived.

Jackson's body will be released after 6 p.m. PST.