Michael Jackson’s doctor administered a powerful anaesthetic to help him sleep, it is claimed

The home of Michael Jackson's personal doctor is being searced by authorities.

Officials with the Drug Enforcement Administration were at Dr Conrad Murray's home in Las Vegas as part of a manslaughter investigation into the singer's death.

Murray was Michael Jackson's personal physician and was with Jackson when he died.

Murray, who is licensed in California, Nevada and Texas, had his Houston office and a storage unit searched last week by DEA agents.

Court records show the agents were seeking evidence of whether the doctor committed manslaughter.

Police say Murray is cooperating and have not labelled him a suspect.

Meanwhile a law enforcement official with knowledge of the investigation into the singer's death says Murray told investigators he administered the powerful anesthetic that authorities believe killed the pop star.

The official, who requested anonymity because the probe is ongoing, said that Dr Conrad Murray said he gave Jackson propofol the day he died. Murray said he had administered the drug several times previously to help Jackson sleep.

The official said police found propofol and various sedatives in a walk-in closet in Jackson's room. Propofol is only supposed to be administered in medical settings.

Murray's lawyer has said the doctor didn't prescribe or administer anything that should have killed Jackson.