DEA agents, Los Angeles police and Las Vegas police are executing search warrants on the Las Vegas home and office of Michael Jackson’s personal physician Dr. Conrad Murray, a law enforcement official tells FOXNews.com. The officials descended on Murray’s gated community and his office, Global Cardiovascular Associates, early Tuesday morning.

The searches are the latest developments in a month-long manslaughter investigation that increasingly places Murray at the center of the mystery surrounding Jackson’s June 25 death.

Murray admitted to authorities that he administered the powerful sedative that experts believe killed the pop star, a law enforcement official told FOXNews.com. The official told FOXNews.com that Murray said he gave Jackson propofol shortly after midnight on June 25, the day of the King of Pop's death

Murray's lawyer, Edward Chernoff, has said the doctor "didn't prescribe or administer anything that should have killed Michael Jackson." When asked Monday about law enforcement officials’ anonymous statements, he said: "We will not be commenting on rumors, innuendo or unnamed sources."

Late Tuesday Chernoff issued a statement confirming the search at Murray's Las Vegas home and office.

"The search warrant authorized investigators to look for medical records relating to Michael Jackson and all of his reported aliases," the statement read. "Dr. Murray was present during the search of his home and assisted the officers. Investigators left Dr. Murray¹s home around 12 noon, seizing cell phones and a computer hard drive."

Last week, FOXNews.com reported exclusively that the investigative team heading the probe into Michael Jackson’s death conducted interviews with physicians and personnel at medical facilities in Las Vegas.

FULL COVERAGE: Click here to read all of FOXNews.com's coverage of Michael Jackson's death.

The warrants issued Tuesday by law enforcement officials followed a similar search at Murray’s Houston office last week. The warrant issued last Thursday allowed authorities to look for "property or items constituting evidence of the offense of manslaughter that tend to show that Dr. Conrad Murray committed the said criminal offense."

The search warrant was granted based on preliminary toxicology reports that indicate that propofol contributed to the death of the King of Pop.

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.

A source told FOXNews.com that the King of Pop relied on propofol 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.

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Murray, 51, has been identified in court papers as the subject of a manslaughter investigation, and authorities last week raided his office and a storage unit in Houston. Police say Murray is cooperating and have not labeled him a suspect.

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."

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.

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.

FOXNews.com's Jana Winter and the Associated Press contributed to this report.