Pictured: Drugs investigators search Michael Jackson's doctor's home in manslaughter investigation

Federal agents searched the home of michael jackson 's doctor yesterday as focus turned to the role a powerful sedative that may have played in the singer's death.
Officials from the Drug Enforcement Administration (DEA) were seen entering Dr Conrad Murray's house and his office in Las Vegas as part of a potential manslaughter probe.
It follows reports that police think the physician gave the pop star propofol to help him sleep shortly before he died.

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Vehicles line the street as investigators search the home of michael jackson 's physician, Dr. Conrad Murray in Red Rock Country Club in Las Vegas yesterday, seeking documents as part of a manslaughter investigation into the singer's death

A Las Vegas police officer leaves Global Cardiovascular Associates Inc., Dr Murray's medical office, after it, also was searched

Officers are working on the theory that the powerful sedative - which Jackson reportedly used 'like an alarm clock' - caused his heart to stop, it has been suggested.
Los Angeles police accompanied DEA agents as they entered Dr Murray's home in a gated community with a search warrant.
Meanwhile, a separate raid took place across town at the doctor's offices.
Yesterday's raid followed that on Dr Murray's clinic in Houston, Texas, last week.
On that occasion, agents spent two-and-a-half hours at the site, leaving with 21 documents and a 'forensic image' of a computer hard drive.
Michael Flanagan, assistant special agent in charge of the Las Vegas DEA office, said today's warrants were sealed and that he could not reveal what documents agents were seeking.
Scroll down to see video about the investigation

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Michael Jackson and was being treated by Dr Conrad Murray

But the investigation is increasingly focusing on the role of Dr Murray, Jackson's personal physician, who was with him when he died.
The doctor has been quizzed twice by police in Los Angeles as part of their probe, with a third interview planned.
He has not been named as a suspect but court records have identified the 51-year-old physician as the subject of a manslaughter investigation. Police say he is cooperating with the investigation.
Investigators have revealed that Jackson regularly received the anaesthetic propofol on a drip and relied on it like an alarm clock.
A doctor would administer it when Jackson went to sleep, then stop the IV drip when the singer wanted to wake up, the unnamed official told the Associated Press.
On June 25, the day Jackson died, Dr Conrad Murray gave him the drug through an IV at some time after midnight, the official said.

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DEA agents arrive prepared to cart away documents from Dr Murray's home that they hope will help them in the investigation

Murray's lawyer, Edward Chernoff, has said the doctor 'didn't prescribe or administer anything that should have killed Michael Jackson'.
When asked yesterday about the law enforcement official's statements he said: 'We will not be commenting on rumours, innuendo or unnamed sources.'
In a more detailed statement posted online late last night, Chernoff added that 'things tend to shake out when all the facts are made known, and I'm sure that will happen here as well'.
Toxicology reports are still pending, but investigators are working under the theory that propofol caused Jackson's heart to stop, the official said.
Jackson is believed to have been using the drug for about two years, and investigators are trying to determine how many other doctors administered it, the official said.
Using propofol to sleep exceeds the drug's intended purpose. The drug can depress breathing and lower heart rates and blood pressure.
Because of the risks, propofol is supposed to be administered only in medical settings by trained personnel.

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The body of pop singer Michael Jackson is loaded into a van to be taken to the Los Angeles County Coroner's office shortly after he was pronounced dead

Murray became Jackson's personal physician in May and was to accompany him to London for a series of concerts starting in July.
He was staying with Jackson in the Los Angeles mansion and, according to Chernoff, 'happened to find' an unconscious Jackson in the pop star's bedroom the morning of June 25.
Murray tried to revive him by compressing his chest with one hand while supporting Jackson's back with the other.
The official also provided a glimpse into how the pop star was living in the weeks before he died, describing the room in which Jackson slept in his rented Beverly Hills mansion as outfitted with oxygen tanks and an IV drip.
Another of Jackson's bedrooms was a shambles, with clothes and other items strewn about and handwritten notes stuck on the walls.
One read: 'Children are sweet and innocent.'

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Paris Jackson, left, Prince Michael Jackson I and Prince Michael Jackson II on stage during the memorial service for Michael Jackson

The temperature upstairs was stiflingly hot when authorities arrived at the singer's house after his death.
Gas fireplaces and the heating system were on high because Jackson always complained of feeling cold, the official said.
A porcelain girl doll wearing a dress was found on top of the covers of the bed where he slept, the official said.
Police found propofol and other drugs in the home. An IV line and three tanks of oxygen were in the room where Jackson slept, and 15 more oxygen tanks were in a security guard's shack, the official said.
Elsewhere, Michael Jackson's children could miss out on a $20 million life insurance payout because an aide allowed the policy to lapse.
The singer's family are planning legal action against the assistant who they reportedly believe kept the cash that had been put aside for insurance.
Dr Steven Hoefflin, the plastic surgeon who became one of Jackson's closest friends, said that the affair highlighted the 'deception and incompetence' of the hangers-on who surrounded the singer in his final days.
'The family have told me that, utterly unbelievably and horrifyingly, one of his aides did not keep up with payments in the last months of his life. They believe he was pocketing the money,' he told The Sun.
Because the final payments were missed it is understood that Jackson's children will now receive around $2.5 million rather than the $22.5 million to which they would have been entitled.
His children Prince Michael, 12, Paris, 11, and Prince Michael II, 7, commonly known as Blanket, will inherit his $300 million share in The Beatles back catalogue but the rights are mortgaged up to the hilt and the singer is facing a range of legal claims on his estate.