INGLEWOOD, Calif. - Michael Jackson's former nutritionist is the latest person authorities are tapping as they piece together the star's medical history.

Los Angeles County Coroner's officials are at the Inglewood office of Cherilyn Lee, serving a subpoena for records related to her treatment of Jackson, Lee's spokeswoman says.

Belinda Foster says Lee is co-operating with investigators but required a subpoena because the records were protected by law.

Lee treated Jackson between January and April, when she says he began persistently asking her for the powerful anesthetic central to the death investigation.

The subpoena comes hours after Los Angeles police and federal drug agents raided the Houston office of Jackson's personal physician.