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A toxicology report from Prince's autopsy, obtained Monday by The Associated Press, shows he had what multiple experts called an "exceedingly high" concentration of fentanyl in his body when he died.

Prince was 57 when he was found alone and unresponsive in an elevator at his Paisley Park estate on April 21, 2016. Public data released six weeks after his death showed he died of an accidental overdose of fentanyl, a synthetic opioid 50 times more powerful than heroin.

His life and music

A confidential toxicology report obtained by the AP provides some insight into just how much fentanyl was in his system. Experts who are not connected to the Prince investigation said the numbers leave no doubt that fentanyl killed him.

"The amount in his blood is exceedingly high, even for somebody who is a chronic pain patient on fentanyl patches," said Dr. Lewis Nelson, chairman of emergency medicine at Rutgers New Jersey Medical School. He called the fentanyl concentrations "a pretty clear smoking gun."

The report says the concentration of fentanyl in Prince's blood was 67.8 micrograms per liter. The report explains that fatalities have been documented in people with blood levels ranging from three to 58 micrograms per liter.

The report also says the level of fentanyl in Prince's liver was 450 micrograms per kilogram, and notes that liver concentrations greater than 69 micrograms per kilogram "seem to represent overdose or fatal toxicity cases."

There was also what experts called a potentially lethal amount of fentanyl in Prince's stomach. Dr. Charles McKay, president of the American College of Medical Toxicology, said generally speaking, the findings suggest Prince took the drug orally, while fentanyl in the blood and liver suggest it had some time to circulate before he died.

Decision in Prince case coming in 'near future'

Experts say there is no "lethal level" at which fentanyl can kill. A person who takes prescription opioids for a long time builds up a tolerance, and a dose that could kill one person might help another.

Search warrants released about a year after Prince's death showed authorities found numerous pills in various containers around his home. A lab report obtained by the AP shows many of the pills tested positive for fentanyl and other drugs. Information that has been released publicly indicates the source of those drugs hasn't been determined.

Last week, the lead prosecutor in the county where Prince died said in a statement that he was reviewing law enforcement reports and would make a decision on whether to charge anyone "in the near future."

Arts and Culture

Minnesota News

Prince: His life and music

Amy Forliti, Associated Press

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Experts who are not connected to the Prince investigation said the numbers leave no doubt that fentanyl killed him.

Performing during a Super Bowl halftime show.

Experts: Prince toxicology report shows very high drug level

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