Michael Jackson Michael Jackson

The Los Angeles coroner's office ruled Michael Jackson's death a homicide and an unsealed warrant said the singer had a lethal dose of the anesthetic propofol in his body when he died, the Associated Press reports.

Jackson's personal physician, Dr. Conrad Murray, told officers that he was treating the singer for insomnia for about six weeks and had been giving Jackson 50 milligrams of propofol every night intravenously, according to the search warrant affidavit, which was obtained by the Los Angeles Times.

The official coroner's report has been sealed at the request of the Los Angeles Police Department. TVGuide.com's calls to the coroner's office were not immediately returned.

Murray told the LAPD he was concerned about Jackson getting addicted to propofol and tried to wean him off by lowering dosages to 25 milligrams and mixing the drug with two other sedatives, lorazepam and midazolam, the Times said. On June 23, two days before Jackson's death, Murray said he gave the singer the two drugs without propofol.

On the morning of Jackson's death, Murray said he tried to induce sleep without propofol. At 1:30 a.m., he said he gave Jackson valium and when that was unsuccessful, he gave him lorazepam intravenously at 2 a.m. An hour later, he said he gave him midazolam because the singer was still awake and administered a variety of drugs to Jackson over the next few hours, the search warrant affidavit said.

At 10:40 a.m., Murray said he gave Jackson 25 milligrams of propofol after the singer repeatedly demanded the drug. Murray said he left Jackson alone to make phone calls to
his Houston office and family members. When he returned, Jackson was not breathing and Murray started to perform CPR while another staff member called 911, the affidavit said. Jackson was declared dead at UCLA Medical Center later that day.

Murray, whose home and medical offices have been searched, has denied wrongdoing, saying in a video message last week that "the truth will prevail."

Detectives are investigating whether Murray's decision to give Jackson propofol as a sleep aid outside of a hospital qualifies as negligence that could lead to an involuntary manslaughter charge, the affidavit said.