The dying of US actress Hayden Panettiere has been dominated unintended, ending a native probe into her dying, police in South Carolina have said.

The Heroes and Nashville star died in August from the poisonous results of fentanyl, Xanax and several other medication in her system, at the age of 36.

Citing the health worker’s report last month that discovered Panettiere died from a drug overdose, the Greenville Police Department said it had “concluded its investigation” into her dying.

The US Drug Enforcement Agency (DEA) reportedly joined a native police probe. It is unclear if that investigation has also concluded. The BBC has contacted the DEA for remark.

“Based on the Medical Examiner’s determination and the findings of the investigation, Hayden Panettiere’s death has been ruled accidental,” police said in a assertion.

Authorities, including the DEA, were reportedly investigating the circumstances of Panettiere’s dying, according to the BBC’s US media accomplice CBS News.