In Greenville, South Carolina, an investigation is underway into the death of actress Hayden Panettiere. She was found unresponsive at an apartment complex on Sunday.

Further details about the incident are limited, but it is known that emergency responders attempted to revive her.

The coroner's office has completed an autopsy, though the official cause of death has not been determined and is pending additional testing, according to the Greenville County Coroner’s Office.