Actress Hayden Panettiere has died at the age of 36, though the cause of death remains undetermined. An autopsy completed by the coroner’s office revealed no evidence of trauma. Despite the initial findings, the investigation into her death is still active and ongoing as officials seek to establish a definitive cause. Further details have not been released at this time. NBC News correspondent Steve Patterson is reporting on the developing story. The lack of immediately apparent causes has fueled speculation, but authorities have not yet commented on potential factors. This is a developing story and will be updated as more information becomes available.