Since Prince's death, there's been much speculation over the vault at Paisley Park Studios, which has been said to contain recordings, memorabilia and more.
Authorities in Minnesota on Thursday released thousands of videos and images taken from Paisley Park during the investigation into the death of the iconic singer.
The pop icon's issues with prescription medication became increasingly clear to those within his inner circle in the weeks before he died on April 21, 2016, from an accidental fentanyl overdose at the age of 57. While Johnson said he didn't realize that opioids were a problem until that overdose, he had noticed Prince was unwell before that and took him to a doctor.
Andrew Kornfeld told investigators that Prince was still warm to the touch when he was found, but that rigor mortis had begun to set in.
The next morning, phone messages showed the doctor texting Johnson: "I have records and test results". Metz said some of Prince's friends might have enabled him as they tried to protect him.
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"But suspicions and innuendo are categorically insufficient to support any criminal charges". A federal investigation is now inactive unless new information comes forward. Schulenberg disputes that, but paid $30,000 to settle allegations the drug was prescribed illegally.
Dr Schulenberg admitted no liability as part of the settlement and has maintained he did not prescribe drugs to anyone with the intention they be redirected to Prince. The medical report claimed that there was 67.8 micrograms of fentanyl per liter of blood in his bloodstream. Prince did not have a prescription for fentanyl.
The underground market for counterfeit prescription pain pills is brisk and can be highly anonymous, said Carol Falkowski, CEO of Drug Abuse Dialogues, a Minnesota-based drug abuse training and consulting organisation.
"Despite "intensive" investigation", Metz said law enforcement was unable to determine who provided the counterfeit Vicodin laced with fentanyl that killed Prince.