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, 36, was found “unresponsive” in a Greenville, South Carolina, apartment just before 2 p.m. Sunday – and medics tried to resuscitate her with “advanced cardiac life support,” TMZ reported.

Medics performed chest compressions but she was pronounced dead at 2:32 p.m.

Cops revealed Sunday her death had no “signs of foul play” in her death. Police said she was found by an “acquaintance,” without revealing their identity.

An autopsy is set to be carried out Monday.