Investigators in Minnesota have questioned a doctor who prescribed medication for Prince during the weeks before he died, a police search warrant shows.
Michael Schulenberg, a local family practice doctor, had treated the musician twice, including the day before he died, and showed up at his Paisley Park estate the morning of his death on April 21 with test results, the document obtained by the Los Angeles Times showed Tuesday.
Prince, 57, had already been pronounced dead by the time the physician arrived after the musician was found collapsed in an elevator.
The warrant does not say what Schulenberg prescribed, for what ailment or whether Prince took the drugs, from a prescription to be filled at a Walgreens pharmacy.
The police also conducted another search of the pop star's Minneapolis home and seized medical records from the hospital where Schulenberg worked, it shows.
The cause of death is still unknown, and investigators are examining whether he died of an opioid overdose.
Authorities found prescription painkillers in Prince's possession after his death, officials said.
A medical examiner has said full results of a post-mortem examination could take several weeks to obtain, although the Carver County Sheriff's office said there was no sign of trauma or evidence of suicide.
Police were investigating the scene of Prince's death again early Wednesday morning.
"Detectives are revisiting the scene at Paisley Park as a component of a complete investigation," the Carver County Sheriff's office tweeted, adding that no other information was available.