Musician and singer Prince died of an overdose of opioids, a law enforcement official has told the Associated Press news agency.
Investigators have been reviewing whether Prince died of an overdose and whether a doctor was prescribing him drugs in the weeks before his death.
The 57-year-old singer was found dead on 21 April at his Minneapolis-area estate.
The findings confirm suspicions that opioids played a role in the musician's death.
Prince's death came less than a week after his plane made an emergency stop in Illinois, for medical treatment as he was returning from an Atlanta concert.
The official said Prince was found unconscious on the plane.
First responders gave him a shot of Narcan, an antidote used in suspected opioid overdoses.
At least two doctors' names have come up in the death investigation.
Dr Michael Todd Schulenberg, a family practitioner, treated Prince twice in the weeks before his death and told investigators he prescribed medications for the singer.
The medications were not specified in a search warrant for the Minnesota hospital that employed Dr Schulenberg at the time.
Dr Schulenberg saw Prince on 7 April and 20 April - the day before his death - according to the warrant.
The doctor's lawyer has declined to comment on the case.
Dr Howard Kornfeld, a California addiction specialist, was asked by Prince's representatives on 20 April to help the singer.
He sent his son Andrew on a redeye flight that night.
Andrew was among the people who found Prince's unresponsive body the next morning, according to Dr Kornfeld's lawyer, William Mauzy.
The younger Kornfeld, who is not a doctor, was carrying buprenorphine, a medication that can be used to treat opioid addiction.
The medication eases cravings and withdrawal symptoms, Mr Mauzy said.
Mr Mauzy explained that Andrew Kornfeld intended to give the medication to a Minnesota doctor who had cleared his schedule to see Prince on 21 April.
Mr Mauzy has refused to identify that doctor. Dr Schulenberg is not authorised to prescribe buprenorphine.
Prince's death came two weeks after he cancelled concerts in Atlanta, saying he wasn't feeling well.
The superstar had a reputation for clean living, and some friends said they never saw any sign of drug use.
But longtime friend and collaborator Sheila E has told the Associated Press that Prince had physical issues from performing, citing hip and knee problems that she said came from years of jumping off risers and stage speakers in heels.
Investigators have been reviewing whether Prince died of an overdose and whether a doctor was prescribing him drugs in the weeks before his death.
The 57-year-old singer was found dead on 21 April at his Minneapolis-area estate.
The findings confirm suspicions that opioids played a role in the musician's death.
Prince's death came less than a week after his plane made an emergency stop in Illinois, for medical treatment as he was returning from an Atlanta concert.
The official said Prince was found unconscious on the plane.
First responders gave him a shot of Narcan, an antidote used in suspected opioid overdoses.
At least two doctors' names have come up in the death investigation.
Dr Michael Todd Schulenberg, a family practitioner, treated Prince twice in the weeks before his death and told investigators he prescribed medications for the singer.
The medications were not specified in a search warrant for the Minnesota hospital that employed Dr Schulenberg at the time.
Dr Schulenberg saw Prince on 7 April and 20 April - the day before his death - according to the warrant.
The doctor's lawyer has declined to comment on the case.
Dr Howard Kornfeld, a California addiction specialist, was asked by Prince's representatives on 20 April to help the singer.
He sent his son Andrew on a redeye flight that night.
Andrew was among the people who found Prince's unresponsive body the next morning, according to Dr Kornfeld's lawyer, William Mauzy.
The younger Kornfeld, who is not a doctor, was carrying buprenorphine, a medication that can be used to treat opioid addiction.
The medication eases cravings and withdrawal symptoms, Mr Mauzy said.
Mr Mauzy explained that Andrew Kornfeld intended to give the medication to a Minnesota doctor who had cleared his schedule to see Prince on 21 April.
Mr Mauzy has refused to identify that doctor. Dr Schulenberg is not authorised to prescribe buprenorphine.
Prince's death came two weeks after he cancelled concerts in Atlanta, saying he wasn't feeling well.
The superstar had a reputation for clean living, and some friends said they never saw any sign of drug use.
But longtime friend and collaborator Sheila E has told the Associated Press that Prince had physical issues from performing, citing hip and knee problems that she said came from years of jumping off risers and stage speakers in heels.
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