Los Angeles  - The autopsy of pop star Michael Jackson has been completed but the results are not yet being released, the Los Angeles medical examiner said Monday.

According to the Los Angeles Times, the results are to be withheld from the public in consideration of the police investigation into the cause of his death on June 25.

No date was given for the possible release of the imminent cause of death.

Jackson died of cardiac arrest at age 50. His private physician Conrad Murray is suspected of having given the singer a dangerous anaesthetic agent called Propfol to help him sleep, just hours before his death. The drug is normally administered directly into the veins.

Police are investigating possible manslaughter charges against the 51-year-old physician. He also stands under suspicion of having given an addict drugs by prescribing illegal medications, the newspaper reported recently quoting police sources. (dpa)