Court documents review Prince's battle with addiction in days before death

Prince was 57 when he was found alone and unresponsive in a lift at his Paisley Park home in Minneapolis on April 21 last year.

A doctor who saw Prince in the days before he died had prescribed pain medication oxycodone under the name of the singer's friend to protect his privacy, according to court documents.

But the documents, unsealed on Monday as the year-long investigation into Prince's death continues, revealed nothing about how the pop superstar got the fentanyl that actually killed him.