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By Erik Ortiz

Prince was set to meet with a prominent San Francisco-area doctor to help treat his reported addiction to painkillers — but died the day before the supposed visit, according to a Minneapolis attorney who spoke with the Star Tribune.

Prince representatives had called for Dr. Howard Kornfeld, who runs rehab center Recovery Without Walls, on April 20 to see the pop superstar, according to lawyer William Mauzy, who works with the Kornfeld family.

"The plan was to quickly evaluate his health and devise a treatment plan," Mauzy told the Star Tribune on Tuesday, adding that he was on a "lifesaving mission."

Related: Cops Got Unverified Tip About Prince and Cocaine in 2011

Kornfeld could not fly out to Prince's Paisley Park estate in suburban Minneapolis the following day, but scheduled to go on April 22, Mauzy told the newspaper. By then it was too late: The day before — on April 21 — the 57-year-old Grammy-winning artist was found dead.

NBC News could not immediately verify Mauzy's claims. Tyka Nelson, Prince’s sister, declined to discuss her brother’s death Tuesday, telling the Star Tribune: "I have nothing to say."

An autopsy was conducted, but a cause of death has not yet been released.

Prince's longtime lawyer, Londell McMillan, has disputed the recent reports suggesting the "Purple Rain" singer had problems with prescription drugs or that his death was narcotics-related.

Singer and musician Prince performs on stage at the Stade de France in Saint-Denis, outside Paris on June 30, 2011.BERTRAND GUAY / AFP - Getty Images, file

"Everybody who knows Prince knows he wasn't walking around drugged up," McMillan told The Associated Press last week. "That's foolish. No one ever saw Prince and said, 'He looks high.' It wasn't what he was about."

Police released more 911 logs related to the late star, including a 2011 tip from a woman who said she was concerned about his alleged "cocaine habits."

The name of the caller was redacted. Since the information in the call was a year old, the Carver County Sheriff's Office concluded there was no immediate danger to the singer and the incident was closed.

Meanwhile, Prince's $300 million music fortune remains up for grabs.

Financial advisers in charge of his estate said in court this week that they are still looking for any type of will he might have had. Nelson has claimed that he had no will or trust, so it's expected his estate will be divided between Nelson and the singer's five half-siblings.