LA police are treating Michael Jackson's death as homicide.
The website TMZ alleges that the initial investigation has identified the anesthetic Propofol as the primary cause of his death.
"Law enforcement sources say there is already 'plenty of powerful evidence' linking Dr Conrad Murray as the person who administered the drug to 50-year-old Jackson.
The evidence includes various items found in Jackson's house, including the Propofol, an IV stand and oxygen tank."
Dr Murray's lawyer would neither confirm nor deny if Dr Murray administered the Propofol.