The cause of Hayden Panettiere's death has been confirmed as a fentanyl overdose, according to The Guardian. The actor, who was 36, was found unresponsive before her death, The Independent reports.
An autopsy established that she died from a drug overdose, the BBC reports. Sky News also reported the autopsy findings. The Guardian was the outlet that specified fentanyl as the substance involved.
Panettiere was known for roles including the television series Heroes and the Scream film franchise, which Sky News referenced in its coverage. ABC News reported that she was remembered at a memorial service in Malibu.

The confirmation of her cause of death follows the earlier reporting that she had been found unresponsive. Coverage of her death has come from multiple outlets, with the BBC, The Independent, Sky News and ABC News each reporting on the autopsy outcome and the memorial. The Guardian's report is the source for the specific finding that fentanyl was involved.
Further reporting is expected on the circumstances surrounding her death and on any additional details from the autopsy.






