Timeline: Prince death case

April 7, 2016: Blaming the flu, Prince cancels two concerts in Atlanta. Meanwhile, Dr. Michael Todd Schulenberg, a family practitioner who is treating Prince to help him withdraw from his opioid addiction, sees him on this date, according to a search warrant.

April 14, 2016: Prince returns to Atlanta and performs two concerts.

April 15, 2016: While returning to Minneapolis, Prince's private plane makes an emergency landing in Moline, Ill., about 1:15 a.m. after he overdoses on opioids, according to a source. A bodyguard carries Prince, who is unconscious, from the plane. Emergency responders administer a shot of Narcan, an opioid antidote, and take him to the hospital. He does not stay, however, and returns to Minneapolis later that morning. Prince admitted that he had taken painkillers, according to search warrants.

April 16, 2016: Prince invites guests to a dance party at Paisley Park, where he plays "Chopsticks" on his new purple piano and shows off a metallic purple guitar. In a brief speech, he tells his audience to "Wait a few days" before offering any prayers.

April 19, 2016: Prince attends a concert at the Dakota in Minneapolis. It is the last time he is seen in public.

April 20, 2016: Schulenberg treats Prince again. That night, a Prince representative in California contacts Dr. Howard Kornfeld, a California addiction specialist, and asks him to intervene and help get the megastar off prescription painkillers. Kornfeld cannot clear his schedule to fly to Minnesota immediately, so he sends his son, Andrew, on an overnight flight. Andrew Kornfeld told investigators that without his father's knowledge he brought a drug used to help with opioid addiction treatment, though it was never administered.

April 21, 2016: Shortly after arriving at Paisley Park about 9:30 a.m., Andrew Kornfeld and two Prince staffers — longtime friend Kirk Johnson and personal assistant Meron Bekure — find Prince's body in an elevator. Kornfeld calls 911 at 9:43 a.m. Emergency responders arrive five minutes later and pronounce him dead at 10:07 a.m. Schulenberg arrives at some point before police show up and tells an investigator that he was there to deliver test results to Prince, according to a search warrant. He also tells the investigator that he had prescribed oxycodone to be filled at a Walgreens pharmacy. He says he wrote the prescription in Johnson's name to protect Prince's privacy.

April 21, 2016: Several hours after Prince's body is found, investigators obtain a search warrant and search Paisley Park, obtaining dozens of pills.

April 23, 2016: Prince is cremated and a private funeral service is held at Paisley Park.

June 2, 2016: The Midwest Medical Examiner's Office releases a report that says Prince died from an accidental, self-administered overdose of the powerful drug fentanyl.

August 2016: Pills marked as hydrocodone that were seized from Paisley Park after Prince's death are found to contain fentanyl, indicating that they were counterfeits, a source with knowledge of the investigation tells the Star Tribune. Investigators found no prescriptions for fentanyl in Prince's name.

April 17, 2017: Carver County authorities unseal 11 search warrant affidavits related to the investigation into Prince's death. They found nothing that would confirm the source of the fentanyl that killed him.

April 19, 2018: Carver County Attorney Mark Metz announces that he was closing the two-year criminal investigation into Prince's death without filing any criminal charges. Metz explained that county, state and federal investigators were unable to develop "credible evidence" documenting the source of the fentanyl that killed the musician, who likely believed he was taking a prescription painkiller. In fact, the pills he took were counterfeit Vicodin. The U.S. Attorney's office said it had no evidence of a federal crime, either. It did, however, announce a civil settlement with Schulenberg, who admitted to prescribing Percocet to Prince's close associate, Kirk Johnson, knowing that it was in fact intended for Prince.