A powerful drug commonly used as a general anaesthetic before surgery was discovered by investigators at Michael Jackson's home, the TMZ.com celebrity news website says.
Citing unidentified sources, TMZ on Tuesday said the drug Propofol was found at Jackson's rented mansion following his death from an apparent cardiac arrest last Thursday at the age of 50.
The website described the drug as an "extremely dangerous and potent" substance which was only available to medical personnel.
"There is no conceivable way this drug can be properly prescribed for home use," a source told the website.
Earlier, a former nurse who cared for Jackson told CNN on Tuesday that the star pleaded with her to provide him with Diprivan - the brand name for Propofol in the last months of his life.
Cherilyn Lee, a health practitioner with more than 20 years experience, said she had refused his request for the drugs.
Lee also revealed that a member of Jackson's staff sought the drug four days before the singer's death only to be rebuffed.
"I told him this medication is not safe," Lee said.
"He said, 'I just want to get some sleep. You don't understand. I just want to be able to be knocked out and go to sleep.'"
"I told him - and it is so painful that I actually felt it in my whole spirit - 'If you take that you might not wake up.'"
CNN said it could not independently verify whether Lee had worked for Jackson.
Lee was also unable to explain why she was contacted by Jackson's staff last week more than three months after she had ceased to work for him.
Several friends and associates of Jackson have said the singer had easy access to prescription drugs and they may have contributed to his death.
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