Michael Jackson's 911 Call Delayed For Over An Hour

Michael Jackson's private doctor waited over an hour to call emergency services when he realised the singer was not breathing, according to newly-released documents.

Police filed the documents to support their request to search a Las Vegas pharmacy in August.

They provide new insight into what happened on June 25, when the 50-year-old "King of Pop" went into cardiac arrest and died.

They state that Jackson's physician Conrad Murray told authorities he administered the anaesthetic propofol after trying other medications to help Jackson sleep, and after Jackson's "repeated demands" for the drug.

Jackson went into cardiac arrest within 20 minutes of that injection, while Murray had stepped out to use the bathroom, the doctor told authorities a few days after the death.

By Murray's own account to police, he did not call for help until 12:22 pm, more than an hour after he realised Jackson was not breathing.

Telephone records show that Murray used his mobile phone for 47 minutes, with three different callers, from 11:18am to 12:05pm, a period during which the doctor said he was conducting CPR.

"Murray did not mention this to the interviewing detectives," the documents state.

Police have not disclosed to whom they believe Murray spoke in those calls.

Police found medication bottles for at least eight different sedatives by Jackson's bed and around his home.

Dr Murray, 56, has not been charged with a crime, but the details in these documents show authorities were suspicious of his behaviour, even as they took Jackson to UCLA Medical Center to try to revive him.

Murray was asked to sign the death certificate but vanished from the hospital premises.

"Upon arrival at UCLA Medical Center, neither the coroner's investigators nor detectives could locate Murray to re-interview him," according to the documents.

Repeated attempts to contact him were unsuccessful.

Propofol is usually used in medical settings by anaesthesia professionals to render patients unconscious for surgery. Officials say it is not meant for use as a sleep agent.

However, the milky liquid drug is not regulated as a controlled substance in the US.