Hayden Panettiere dies at 36

Actress Hayden Panettiere, known for roles in 'Heroes' and 'Nashville,' died at age 36 in South Carolina.

An autopsy found no signs of trauma, and the cause of death remains under investigation.

The DEA has joined the investigation into her death, which occurred at an apartment complex in Greenville.

Panettiere had been open about her struggles with addiction and mental health, and had recently published a bestselling memoir.