Los Angeles police investigating the cause of Michael Jackson's death questioned Jacksons doctor extensively on Saturday and determined he has no involvement in the stars death.

Dr Conrad Murray was questioned by Los Angeles Police for three hours and investigators said he responded to every and all questions, according to reports from PEOPLE.

The exact cause of death remains un known Investigators suspect an overdose of prescription drugs might be the reason behind the cardiac arrest that killed Jackson.

A second private autopsy on Jackson's body was completed Saturday at the family's request so they could have a second opinion on the cause of death. The first autopsy conducted Friday was inconclusive and the coroner's office said they will have to wait for toxicology reports, which could take months to complete. However, foul play was ruled out.

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