What is fentanyl? The little-known but deadly drug that killed Prince, US news

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Fentanyl: What do we know about deadly synthetic drug that killed Prince and has gripped the US?

Prince Died Of Accidental Overdose, Says Medical Examiner : The Two-Way : NPR

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Prince died of opioid overdose, official says

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The powerful opioid that killed Prince

Prince death: Opioid painkillers found at singer's home - BBC News

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