The 'Thriller' hitmaker died of a suspected cardiac arrest at his Los Angeles home on June 25, and the mystery surrounding his death has not yet been solved.
TMZ.com which first reported Jackson's death has now leaked the singer's toxicology result claiming that Propofol could be the cause of his death.
Autopsy results to determine the cause of death have yet to be officially released, but some media reports suggest the singer died after taking a dangerously high dose of the surgical painkiller.
According to the website, the leaked results confirm the rumours and reveal Jackson also had traces of anxiety drug Xanax, generically known as alprazolam, in his blood.
Law enforcement sources confirmed to the celebrity website that Propofol is "front and center in terms of why (Jackson) died."
Jackson's death which is being also investigated by officers from the Drug Enforcement Administration (DEA), have confirmed they are considering a charge of manslaughter against the 'King of Pop's personal physician Conrad Murray.
The medic is believed to be responsible for supplying Jackson with prescription drugs.
