By Jen Heger

Breaking Celebrity News Legal Editor

Dr. Conrad Murray's defense team has told jurors that the personal physician to Michael Jackson gave him 25 milligrams of Propofol, but Breaking Celebrity News has exclusively learned that the King of Pop had significantly higher levels of the powerful anesthetic in his system at the time of his death.

Dr. Murray's lawyers contend that when the Houston-based cardiologist left the superstar singer briefly on the morning of June 25, 2009, he grabbed a bottle of the drug, ingested it, and then subsequently died.

As testimony in the involuntary manslaughter trial enters its second week, it's expect