These sources report the tragic and sudden passing of actress Hayden Panettiere at the age of 36. The information, primarily sourced from TMZ, details that she was found unresponsive in a South Carolina home following an apparent cardiac arrest. Fans and community members expressed profound shock, reflecting on her acclaimed roles in Heroes and Nashville while noting the personal hardships she faced, including the recent loss of her brother. While authorities have indicated there are no immediate signs of foul play, an official investigation and autopsy are pending to confirm the exact cause of death. The reports emphasize the heavy emotional toll on her family and the young daughter she leaves behind.