Prince reportedly overdosed on Percocet just days before he was found dead on Thursday in Minnesota.

He was using the drug to treat a hip problem tied to corrective surgery in 2010, according to TMZ.

Prince’s jet plane made an emergency landing in Moline, Illinois last Friday due to a medical emergency. His rep said at the time that the singer was struggling with the flu. But, according to a new report, Prince had to receive a “save shot,” an injection or nasal spray to treat drug overdoses, at the airport. He was also seen pacing outside a Walgreen’s the day before his death.

Percocet is a highly-addictive painkiller that treats moderate to severe pain. It’s a combination of acetaminophen and oxycodone.

Authorities found Prince unresponsive in an elevator when they arrived Thursday morning, responding to a 911 call. First responders tried CPR, but were unable to revive the pop star and he was pronounced dead at 10:07AM.

Police are continuing to investigate the circumstances surrounding Prince’s death. His autopsy is being performed today.

– Variety