Michael Jackson doctor bought drugs in Las Vegas

Jackson died two weeks before he was due to return to the stage in London

Michael Jackson's personal doctor bought anaesthetic Propofol in Las Vegas and had it sent to Los Angeles, newly-released court papers show.

Search warrant records show Dr Conrad Murray bought it in May at about the same time he was hired by Jackson.

The coroner investigating Jackson's death has ruled it was homicide, primarily caused by Propofol.

Dr Murray admits administering the drug to Jackson on the day he died - 25 June - but denies any wrongdoing.

He says he had been injecting Jackson with the drug at the singer's rented Los Angeles house each night to help him sleep.

Propofol is a powerful anaesthetic normally administered to patients having surgery in hospital.

WHAT IS PROPOFOL? A powerful anaesthetic usually used before and during surgery Can also be used in small doses to reduce stress or anxiety Produced as a white, opaque fluid and administered intravenously Marketed under the trade name Diprivan

The newly-released documents were made available following a request from lawyers representing media outlets including the Associated Press, the Los Angeles Times and celebrity website TMZ.

They reveal that investigators found receipts in Dr Murray's Las Vegas office showing that he bought Propofol on 12 May from Applied Pharmacy Services.

Dr Murray, who has not been charged with any crimes, bought five 100ml bottles of the drug costing $853 (£515).

The Drug Enforcement Administration (DEA) said that Dr Murray, who is licensed in Nevada, California and Texas, had not broken any laws in buying Propofol in one state and administering it in another.

Dr Murray's lawyer Edward Chernoff said there were no surprises in the documents.

"The fact that Dr Murray ordered five bottles of Propofol is consistent with what he told investigators," he added.

Los Angeles police are treating Jackson's death as a homicide investigation.