The official, a source with knowledge of the death investigation, spoke to AP on condition of anonymity because he was not authorized to speak to the media.
Minnesota investigators have reportedly finished an autopsy and toxicology testing, but have not publicly released the findings.
The news follows weeks of speculation that the 57-year-old singer was addicted to pain medications when he was found dead April 21 at his Paisley Park estate.
Prince’s use of painkillers and how he obtained them has been the focus of a criminal investigation. A judge has sealed all records in the case, but no charges are known to have been filed.
Prince Rogers Nelson was pronounced dead at 10:07 a.m. April 21 — 19 minutes after emergency responders arrived and tried to resuscitate the iconic artist. Investigators said he was last seen alive at Paisley Park, a sprawling compound that doubled as the reclusive singer’s recording studio and home in Chanhassen, Minn., about 8 the night before.
Prince’s estate manager and personal assistant discovered the singer’s lifeless body in Paisley Park elevator about 9:40 a.m. Andrew Kornfeld, the son of a well-known addiction and pain doctor, phoned 911 after arriving at the estate.
An autopsy revealed no signs of trauma, and Carver County Sheriff Jim Olson has said previously that investigators don’t believe Prince committed suicide.
Though the artist’s closest friends and family have not publicly addressed his alleged addiction, news reports have indicated Prince may have started abusing medications following hip surgery several years ago due to the pounding his body took from decades of lively stage performances.
A week before his unexpected death, a private jet carrying Prince home from a concert in Atlanta had to make an emergency landing in Illinois when the singer reportedly suffered an opioid overdose and lost consciousness. Paramedics who met the plane reportedly gave Prince a shot of the opioid antidote Narcan.
The sudden death of the entertainer has shed light on what the federal government recently called a national epidemic of opioid related overdose deaths.
New guidelines from the U.S. Centers for Disease Control and Prevention urges doctors to avoid prescribing addictive opioid painkillers such as Oxycontin, Percocet and Vicodin whenever possible for patients with most forms of chronic pain.
“More than 40 Americans die each and every day from prescription opioid overdoses,” CDC director Dr. Tom Frieden said in March. “Increased prescribing of opioids — which has quadrupled since 1999 — is fueling an epidemic that is blurring the lines between prescription opioids and illicit opioids.”