July 10, 2009 -- As investigators determine whether prescription drugs played a role in Michael Jackson's death, a number of Jackson's doctors have turned over the performer's medical records, according to the Los Angeles coroner's office.
But until all the records are reviewed and the toxicology reports are back, the Los Angeles Police Department has no way of knowing the nature of any death investigation.
"We are gathering a lot of information, evidence in anticipation of the coroner's report," Los Angeles Police Chief William Bratton told ABC News today.
"Until we come back with his report as to the cause of death, we're not saying anything about it."
Bratton said he'll make public specific details of the LAPD investigation once the coroner's office releases its report in as little as a week.
Meanwhile, sources close to Jackson said his family and friends had long known of his drug abuse and twice attempted interventions in the past four years.
Police have confirmed a laundry list of drugs were found inside the Los Angeles rental home where Jackson died June 25, revealing to the public what his family has known for years -- Michael Jackson was a drug addict.
Another close confidant told "Good Morning America" that Jackson's friends and family attempted to intervene in 2003 but were thwarted when the singer was accused of child molestation.
"We all came together, figuring as a group maybe we could sit down with him. Unfortunately, we never got that opportunity," said Marc Schaffel, a former Jackson friend.
Jackson's drug abuse did not come as a surprise to his fans. In 1993, he released a statement admitting that he would enter rehab to get off the drugs he had been hooked on since enduring burns to his scalp while filming a Pepsi commercial.
"I remain out of the country. I have been undergoing treatment for dependency on pain medication. This medication was initially prescribed to sooth the excruciating pain that I was suffering after recent reconstructive surgery on my scalp," the singer said at the time in a statement.
The Web site TMZ is reporting that the 2003 police raid on Jackson's home, Neverland Ranch, revealed painkillers, sedatives, vials and syringes.
A former business manager told "GMA" that associates who tried to bring up Jackson's addiction with the singer were pushed away or fired.
Source Says Michael Jackson Was Addicted to Demerol
"They were very, very scared about these things and we talked together how can we take care of this, but it was very complicated," said Deiter Wiesner, Jackson's former business manager.
A senior law enforcement official confirmed to ABC News that Jackson was "heavily addicted" to the painkiller Demerol and received "daily does" of OxyContin.
ABC News has also confirmed reports that Jackson's arms were found during the autopsy to be marred with track marks consistent with intravenous use of propofol, sold under the name Diprivan, an anesthetic commonly used to put hospital patients to sleep in the operating room or an intensive care unit.
It has been widely reported that in addition to Demerol and OxyContin, Jackson also abused the anti-anxiety drug Xanax and the antidepressant Zoloft in the months before his death.
In 2002, Jackson was ordered to undergo a medical examination after he failed to show up in a California courtroom in a trial over breach of contract because the pop star said he had a spider bite.
Schaffel, however, said it was not a spider bite but a problem caused by a broken IV needle.
"He had the IV stuff back then," Schaffel previously told ABC News. "It wasn't a spider bite. It was an IV he pulled out his leg. The needle broke off."
Police are turning their attention to several physicians identified by the Jackson family as supplying the singer with prescription drugs.
Jackson's longtime dermatologist Dr. Arnold Klein denied to "GMA" Wednesday that he was under investigation and called the doctors who prescribed addictive drugs for the pop icon "criminals."