A law-enforcement official tells The Associated Press that tests show the music superstar died of an opioid overdose.

The 57-year-old singer was found dead April 21 at his Minneapolis-area estate.

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The official, who is close to the investigation, spoke on condition of anonymity because he was not authorized to speak to the media.

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Investigators have been reviewing whether Prince died of an overdose and whether a doctor was prescribing him drugs in the weeks before his death.

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