Tragic “Heroes” and “Nashville” star Hayden Panettiere’s body was found by a friend who told 911 she was unconscious from an apparent cardiac arrest, according to police sources.

Panettiere’s unidentified pal called 911 at 1:51 p.m. Sunday from a Greenville, SC, apartment to report an “unresponsive female” in “cardiac arrest,” TMZ reported.

Responding paramedics tried to resuscitate the 36-year-old Palisades, NY, native with “advanced cardiac life support,” which can include breathing tubes, defibrillators, and emergency medication such as IV drugs.

Medics also performed chest compressions, but the actress was pronounced dead at 2:32 p.m…

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