CNN reported that the pain-killing substance was found on Prince, while the Star Tribune, in Minneapolis, reported that prescription pills were found where the musician died, at the age of 57, last week, at his home in suburban Minneapolis.
Both reports were based on unidentified law enforcement sources. Various news outlets, including CNN, also reported that local enforcement had requested that the US Drug Enforcement Administration assist in the investigation.
Police have said they found no signs of suicide, nor obvious trauma on the body, and that it could take weeks before autopsy results reveal how Prince died.
The Star Tribune said that authorities were trying to determine what, if any, role opioids might have played in Prince’s death and whether the drugs found at the scene were prescribed to him.
On Wednesday, a judge in Carver County, Minnesota, acting on a request from Prince’s sister, Tyka Nelson, named Bremer Trust, National Association as special administrator to his estate, which is estimated at hundreds of millions of dollars.
Prince’s sister asked for the bank to be appointed, saying it had dealt with the singer’s affairs for years.
A probate hearing was scheduled for May 2.