As preparations for Tuesday's memorial continued, investigators probing the circumstances of Jackson's mysterious death are reported to be looking at the role of five doctors who prescribed drugs to the star.
US media reports citing unidentified law enforcement sources said investigators found the powerful sedative Propofol amongst a variety of prescription medications at Jackson's home.
'Numerous bottles' of Diprivan - the brand name for Propofol - were found at Jackson's home, an unidentified source told the Los Angeles Times.
Propofol is commonly used in hospitals to induce unconsciousness in patients before major surgery. Healthcare experts say it should never be used at home and should only be administered by trained anesthesiologists.
Los Angeles coroners have said a final cause of Jackson's death will not be revealed until exhaustive toxicology tests from his autopsy are completed.
Jackson's family also hired a private pathologist to carry out a separate autopsy but no results of the findings have been made public.
The aftermath of Jackson's death has seen intense speculation about the role of doctors who treated the star.
Police have questioned Jackson's personal physician Conrad Murray but have stressed he is not suspected of criminal wrongdoing.
Associates of Jackson and his family have repeatedly accused unidentified medical professionals of acting as 'enablers' by making prescription drugs readily available.
Meanwhile, the legal wrangling over Jackson's estate gets underway on Monday when two men named as the executors of a 2002 will drawn up by Jackson appear in court for a probation hearing in Los Angeles.
The hearing at the Los Angeles Superior Court comes after Jackson's 79-year-old mother Katherine was awarded temporary control of her son's assets last week before the will surfaced. -- AFP