Toru Hanai/Reuters/Landov
July 29, 2009 07:35 PM

Beverly Hills plastic surgeon Lawrence Koplin has become at least the third physician searched by authorities investigating the death of Michael Jackson.

Coroner Assistant Chief Ed Winter was seen entering the clinic on Wednesday and later told reporters he was searching for the pop star’s medical records.

A woman who answered the phone at Koplin’s office tells PEOPLE, “We’re cooperating with the coroner’s office and we have no comment at this time.”

The latest search comes a day after the Las Vegas home and medical office of Jackson’s personal physician Dr. Conrad Murray were raided by multiple law enforcement agencies in an apparent manslaughter investigation. The L.A. coroner has also subpoenaed records from other former Jackson associates – among them Dr. Arnie Klein, the singer’s longtime dermatologist, and his former nutritionist, Cherilyn Lee.

Meanwhile, Jackson’s autopsy results, which will include a toxicology report and the final cause of death, will probably be delayed until next week, Winter told the Associated Press.

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