Tragic new details about star’s final weeks News.com.au Hayden Panettiere died from accidental overdose of fentanyl and other drugs ABC News & Headlines – Australian Broadcasting Corporation Hayden Panettiere’s cause of death confirmed as fentanyl overdose The Guardian Hayden Panettiere died from accidental overdose weeks after leaving rehab, coroner finds SMH.com.au Hayden Panettiere’s official cause of death released by coroner’s office Nine.com.au