Michael Jackson had lethal levels of powerful painkiller

Michael Jackson had lethal levels of powerful painkiller Demerol and heroin substitute methadone in his body when he died, a report said.

Tests show the tragic star had taken a cocktail of drugs strong enough to kill any normal person instantly.

But he had been on vast quantities so long his body became tolerant to huge doses - until his fatal collapse on June 25.

The shocking findings are in preliminary toxicology reports submitted to the Los Angeles county coroner's office.

The contents were revealed as sources predicted MJ's death could result in manslaughter or even murder charges. Lethal levels of Demerol, Methadone and anti-anxiety drug Xanax were found in his blood tests.

Also present were lower levels of Propofol - an anaesthetic for hospital use only, but which Jackson used as a sleeping draft.

A significant amount of narcotic Dilaudid, normally used to numb post-surgery pain, was also discovered.