The "Purple Rain" hitmaker tragically passed away in 2016 from an accidental fentanyl overdose at the age of 57, leaving behind a vast collection of unreleased music which was known only as "the vault".
Pills and other items were found in Prince's home, Paisley Park, after deputies responded to a call that he'd been found dead April 21, 2016.
Carver County attorney Mark Metz said in a statement: "Despite the intensive law enforcement investigation, there is no reliable evidence showing how Prince obtained the counterfeit Vicodin laced with fentanyl, or who else may have had a role in delivering the counterfeit Vicodin to Prince".
Metz is not filing charges against anyone in Prince's death, which was two years ago tomorrow.
Prince is shown on his back next to a sun design on the carpet. Prince's doctor had prescribed a medication used to treat opioid withdrawal.
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Wright, who didn't remember how many pills Prince claimed he took, told investigators that the amount shouldn't have been enough to require the administration of Narcan. "As licensed professionals, doctors are held to a high level of accountability in their prescribing practices, especially when it comes to highly addictive painkillers".
Prince enters and leaves a clinic in Minnetonka, shortly before he died.
State prosecutors say they haven't determined the source of the fentanyl and no charges will be filed.
And Metz says he doesn't think the people around Prince knew it either. The official spoke on condition of anonymity because the case remains open.
But federal authorities announced that Schulenberg had agreed to pay $30,000 to settle a civil violation from the allegation that he illegally prescribed the opioid oxycodone for Prince in Johnson's name. The medical report claimed that there was 67.8 micrograms of fentanyl per liter of blood in his bloodstream.