Report: Los Angeles Coroner Visits Jackson's Dermatologist

As the results of Michael Jackson’s autopsy grow closer, investigators are reaching out to the King of Pop's former dermatologist for a additional documents, a new report claims.

Assistant Chief Coroner Ed Winter said Monday that some results are in from tests to determine what substances Jackson had in his body when he died. The remaining results are expected at the end of this week or early next week.

Winter said he believes the results will be announced by Friday or next Monday.

According to TMZ, an official from the Coroner's office was at the office of Dr. Arnold Klein -- Jackson's dermatologist -- Tuesday.

Klein has been uncooperative during the investigation, failing to turn over medical files to officials, TMZ reported.

Klein was Jackson's dermatologist for several years, and has been reported to be the sperm donor for two of Jackson's three children, a claim he denies.

Jackson died of apparent heart failure at the age of 50 while preparing for a 50-date London comeback tour.

The Associated Press contributed to this report.