Law enforcement sources in the US have stated that Michael Jackson's doctor, Conrad Murray, administered a drug that led to the King of Pop's death.

Authorities have determined that Jackson had for about two years been regularly using the potent anesthetic, which leaves people in a near comatose state, to help him sleep.

Their hypothesis is that Murray administered the final dose sometime after midnight on the June 25, via an intravenous drip.

Needle marks were discovered on Jackson's neck and arms during the dual autopsies performed on his body, and a source said that toxicology tests performed by the Los Angeles County Coroner's Office found propofol in his blood, eonline.com reported.

Officials carted off vials of the drug, which is marketed under the brand name Diprivan, following a search of Jackson's Holmby Hills home shortly after his death.

Murray's attorney, Edward Chernoff, declined to comment "on rumors, innuendo or unnamed sources," but he previously stated that his client did not prescribe propofol for Jackson or administer any drugs that could have killed the star.

"Things tend to shake out when all the facts are made known, and I'm sure that will happen here as well," Chernoff added in a written statement.

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