What killed Hayden Panettiere…

Hollywood actress Hayden Panettiere, best known for “Heroes” and “Nashville,” has died at 36 after being found in cardiac arrest in South Carolina.

According to CNN, the Greenville County Coroner’s Office said emergency responders were called following a 911 report of cardiac arrest on Sunday, but resuscitation efforts failed. An autopsy conducted Monday found no signs of trauma, though the official cause and manner of death remain pending further testing.

Panettiere had recently opened up about past struggles with addiction and mental health in a memoir before her death.