ET has obtained the audio from Prince's emergency plane landing, which occurred just six days before his death.
On April 15, the pilot transporting Prince on a private plane called into air traffic control to report that he had a male, "unresponsive passenger" on board. The plane made an emergency landing in Moline, Illinois, at which point Prince was transported to a nearby hospital, treated and released three hours later, his rep told ET at the time.
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According to TMZ, Prince was treated for a drug overdose at the hospital and was given a "save shot," which is administered to counteract the effects of an opiate.
The emergency landing occurred just a week after Prince postponed two shows that he claimed was due to the flu.
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On Friday, shortly after an autopsy had been completed on Prince, Carver County Sheriff Jim Olson held a press conference to give an update into the ongoing police investigation surrounding the untimely death of the legendary musician at the age of 57.
"We have no reason to believe at this point that it's a suicide, but it's early on in the investigation," Olson said. "Prince is a very private person and I don't think it would be unusual for him to be there by himself."
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When asked if he knew if Prince had been taking any medication -- including the pain killer, Percocet -- Olson would not comment. "I am not able to confirm that all," he stated, adding that investigators will be "gathering medical records" and talking to "people that [were] close to him."
A source very close to the situation told ET that Prince was battling the flu, which turned into walking pneumonia. The "Purple Rain" singer was also dealing with a hip injury and had a problem with Percocet, according to the source. We are told his issue with the powerful narcotic began years ago, shortly after he underwent hip replacement surgery in 2010.