A tragic loss for a young Hollywood star happened last night. Hayden Panettiere, star of television’s “Heroes” and “Nashville,” as well as numerous films, has passed at the age of 36. Law enforcement sources told “TMZ” that police responded to an incident involving Hayden yesterday and there is currently an open investigation, though the circumstances surrounding her death remain a mystery at this time. Panettiere has been open in the past with struggling with drugs and mental health.