He had been struggling with a dependence on painkillers, Carver County lawyer Mark Metz said.
Prince was 57 when he was found alone and unresponsive in an elevator at his Paisley Park estate in suburban Chanhassen on April 21, 2016.
State prosecutors said Prince's 2016 death - from an accidental fentanyl overdose after taking what he thought was Vicodin - is part of "an unprecedented and horrific epidemic of opioid overdoses in this country" during a press conference announcing no criminal charges will be brought in his death due to a lack of evidence. "We simply do not have sufficient evidence to charge anyone with a crime related to Prince's death".
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They also allege that Gardner knew about the lies, and that her office has frequently withheld evidence from the defense team. For example, he said he didn't take notes during an interview of the woman, but photos and a video showed him taking notes.
Prince was said to have been taking medication to deal with pain but was unaware that he was taking the fentanyl painkillers as the pills were placed in mislabeled bottles and disguised as counterfeit Vicodin.
Some of the pills were prescribed to his bodyguard Kirk Johnson to protect the singer's privacy, Metz said.
In a separate development, a doctor who treated the musician in his final weeks has been fined for allegedly writing a prescription knowing it would be used by another person, the U.S. Attorney for Minnesota said in a statement.
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Associates at Paisley Park told investigators that Prince had been "going through withdrawals, which are believed to be the result of the abuse of prescription medication", according to an affidavit unsealed in state court past year. Authorities found numerous pills in various containers stashed around Prince's home, including some counterfeit pills that contained fentanyl.
Investigators were unable to identify who gave Prince the pills laced with fentanyl, but they said they did not think the drugs were given to the star with the intent to kill or harm him.
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If you're going to have children, she said , you have an obligation to focus on them first. The opinions expressed in this commentary are exclusively those of the author.