Brian Hickerson, 37, and his brother Zachary were together at the scene on Sunday as first responders fought unsuccessfully to revive Panettiere, 36, at an Airbnb in Greenville where she had been staying.
The Heroes actress was found dead aged 36 of a suspected overdose on Sunday at an Airbnb in Greenville, South Carolina, where she had traveled with her on-off boyfriend Brian Hickerson.
On Sunday, Panettiere was found 'unresponsive' at an apartment in the city of Greenville, South Carolina - believed to be an Airbnb - and later pronounced dead at the scene. She was just 36.
Actress Hayden Panettiere was found in cardiac arrest on Sunday, but an autopsy found no signs of trauma that would have contributed to her death, the Greenville County, South Carolina, coroner's office said.
Hollywood is now mourning the loss of Panettiere after she was found dead in Greenville, South Carolina, with a 911 dispatcher describing her as suffering from a 'cardiac arrest.