The fentanyl that led to his overdose was contained in counterfeit pills made to look like a generic version of the painkiller Vicodin. The question of how and from what source Prince obtained the drug that led to his death has been the subject of investigations by several law enforcement agencies. A sealed search warrant was issued for his estate, and another unsealed search warrant was issued for the local Walgreens pharmacy. On April 19, 2018, the Carver County Attorney announced that the multi-agency investigation related to the circumstances of the star's death had ended with no criminal charges filed.