The official, who requested anonymity because the probe is ongoing, told The Associated Press on Monday that Jackson regularly received the anesthetic propofol to go to sleep. The source also said that Dr. Conrad Murrayadministered the powerful drug on the last night of the 50-year-old's life.
Murray was with Jackson when he died on June 25. Last week, his Houston-based medical clinic and public storage unitt was raided by the police and he was identified as the target of a manslaughter investigation in court records.
According to the warrant filed in Harris County District Court, authorities were looking for "items constituting evidence of the offense of manslaughter that tend to show that Dr. Conrad Murray committed the said criminal offense."
Despite authorities' claims, Murray's lawyer, Ed Chernoff, has said the doctor didn't prescribe or administer anything that should have killed Jackson.
Murray, Chernoff has said, "was the last doctor standing when Michael Jackson died and it seems all the fury is directed toward him. Dr. Murray is frustrated by negative and often erroneous media reports, he has to walk around 24-7 with a bodyguard. He can't operate his practice. He can't go to work because he is harassed no matter where he goes."