Investigators looking into Prince's death are seeking to identify every doctor and pharmacy that may have supplied prescription drugs to the singer - including online sources - a law enforcement official said.
A music fan visits a memorial created outside Paisley Park, the home and studio of Prince, where the legend was found dead on April 21.
According to the warrant, Dr. Michael Todd Schulenberg, a family practitioner, had seen Prince twice before he was found in a Paisley Park elevator April 21.
A search warrant affidavit obtained by the Los Angeles Times on Tuesday revealed that a doctor who saw the late pop star Prince twice just weeks before his death and was at the musician's home when Prince's body was found had prescribed him medication.
A spokeswoman for North Memorial Medical Center said Schulenberg was a primary care physician at its Minnetonka clinic but that he no longer works for the health care system.
The website said Schulenberg prescribed Percocet to Prince before his death using his real name, Prince Rogers Nelson.
Dr. Howard Kornfeld, an opioid addiction specialist based in Mill Valley, was contacted by representatives for the singer about an "urgent" medical situation.
When he went to see Prince, Andrew Kornfeld was carrying buprenorphine, which is sometimes used to help opioid addicts withdraw from painkillers, Mauzy said. Prince died six days after his plane made an emergency landing in Moline, Ill, where he was reportedly treated with a "safe shot", i.e. a remedy against opiod pain medications. The warrant was executed at the North Memorial Medical Center, which employed Dr. Schulenberg.
On Tuesday (Wednesday NZT), US Drug Enforcement Administration agents and Carver County deputies were at the Paisley Park compound, where agents were carrying out a search warrant, a law enforcement source told CNN.
The Carver County, Minnesota, Sheriff's Office and several other detectives have revisited Prince's Paisley Park estate as part of their ongoing investigation. Andrew Kornfeld was also the person who called 911.
Telephone messages left for Schulenberg have not been answered, according to the New York Times.