The lonely last hours of the Purple One: Prince, 57, died in his Minnesota estate elevator after speaking to Will Smith - as it's revealed responders were carrying but did NOT use drug antidote Narcan on singer. Prince spent his final night alone in his vast compound and was discovered unconscious in an elevator more than 13 hours after he was last seen alive. Police said the 57-year-old pop superstar was last seen entering his $10million Minnesota estate at 8pm on Wednesday and was not found until the next morning. Prince was taken to a Twin Cities hospital on Wednesday and was seen by a doctor, a law enforcement source told KSTP. He was then seen looking 'frail and nervous' in a Walgreens pharmacy just an hour before he returned to his home in Paisley Park at about 8pm, sources said. Sources added that Prince may have overdosed on the highly addictive painkiller Percocet just days before. One of the music legend's last conversations was with the actor Will Smith, who said he spoke to Prince on the night he died. When Prince missed an early morning holistic medicine appointment on Thursday and couldn’t be reached, staff went to check on him. He was then unresponsive at his home. Carver County Sheriff Jim Olson said here were 'no obvious signs of trauma' on Prince's body when he was found at 9.43am on Thursday, and that investigators had ruled out suicide. Olson, whose deputies responded to an emergency medical call at Prince's compound, said his officers carry a medication that can be given to someone suffering a drug overdose, but did not use it during the call. An autopsy was done Friday but a cause of death hasn't been released, and authorities declined to comment on reports that Prince had been treated for a painkiller overdose less than a week earlier. Sheriff Jim Olson said his officers have been carrying Narcan, which can treat narcotic overdose in an emergency situation, for the past two years as a matter of policy. Minnesota lawmakers gave police agencies the right to carry the opioid antagonist, which blocks the effects of opioids and reverses an overdose, since they are often first responders. The treatment is administered through an injection or nasal spray. Olson said that Prince, who was fully clothed when he was found unresponsive, died less than half an hour after he was discovered by staff despite paramedics' efforts to resuscitate him. Prince's loved ones now face a weeks-long wait for toxicology results to come back, which should reveal whether he did overdose days before his death on Thursday, as sources have claimed Sources told TMZ that he overdosed on Percocet that he was taking for a chronic hip problem he had been suffering for years. The highly addictive painkiller is an opiate, but Sheriff Olson confirmed that officers did not use heroin rescue drug Narcan at the scene. Prince had used a cane to help him walk for years after causing irreparable damage to his hips with his lively stage performances. The Purple Rain star took so many Percocet pills that he had to be given a 'save shot' after his private plane made an emergency landing in Moline, Illinois, so he could be rushed to hospital last Friday, sources close to the star claimed. His plane descended 45,000ft in just 17 minutes after an 'unresponsive male' was reported on board the plane, a source told NBC News, and the fire department and paramedics were alerted of the incoming medical incident. On Thursday night, pictures emerged of Prince walking out of a Walgreens pharmacy just 15 hours before he was pronounced dead. It is not known whether he was picking up Percocet or any other prescription. It is unknown why he went to the store himself or if he picked up a prescription, though per Walgreens protocol, anyone with Prince's phone number and address could have retrieved medication for him. Prince had always claimed that he was drug-free, making the news of his alleged overdose all the more shocking.