Actress Hayden Panettiere's cause of death has been confirmed as an accidental drug overdose, involving fentanyl, Alprazolam, and other medications. The 36-year-old actress, known for her roles in Heroes and Nashville, was found unresponsive in an apartment in South Carolina in August. Panettiere's career spanned from soap operas to major films, but she struggled with addiction and mental health issues. Tributes poured in from co-stars and fans following her tragic passing.