MINNEAPOLIS (AP)- The prosecutor in the Minnesota county where Prince died says he's filing no criminal charges in the musician's death.

The announcement Thursday from Carver County Attorney Mark Metz means the state's investigation into how Prince got the fentanyl that killed him is closed. It came hours after documents revealed a doctor accused of illegally prescribing an opioid for Prince had agreed to pay $30,000 to settle a federal civil violation.

Metz said the evidence shows Prince thought he was taking vicodin, not fentanyl. He said there's no evidence any person associated with Prince knew he possessed any counterfeit pill containing fentanyl.

Prince was 57 when he was found alone and unresponsive in an elevator at his Paisley Park estate on April 21, 2016.