Cuase Of Prince's Death Revealed...

The music legend died of opioid overdose.

Read the exclusive report from TMZ after the cut

"Prince died from an opioid overdose ... it's now official from the Midwest Medical Examiner's Office, and the drug is even more powerful than Percocet.

The M.E. performed toxicology tests on the singer and determined the singer died of an accidental overdose of Fentanyl -- a powerful synthetic opiate that is more potent than morphine ... often used for cancer patients to deal with severe pain.

Fentanyl is a very strong opiate used to treat cancer patients who aren't responsive to Percocet and morphine.

Reports had it Prince was either HIV+ or cancer.

RIP PRINCE!