Her father, Skip Panettiere, announced her death in a statement to ABC News on Sunday.

“It is with profound sadness that we share the tragic passing of our beloved Hayden. She was an incredible light and a force of nature who brought immeasurable love and joy to all who knew her — and to the millions who watched her onscreen,” it read.

Her cause of death has not been announced and is under investigation, her publicist, Kasey Kitchen, told NBC News.

Police were called to an address in Greenville, S.C., at about 1:50 p.m. Sunday, where Panettiere was found unresponsive and pronounced dead at the scene, the U.S agency reported.

Her role as a cheerleader with superpowers in Heroes propelled her to fame in 2006, with the series revolving around the mantra “Save the cheerleader, save the world.”

The actor, who published her memoir This Is Me: A Reckoning in May, had spoken publicly about her struggles with addiction and postpartum depression after the birth of her daughter with Ukrainian boxer Wladimir Klitschko in 2014. He has had full custody of the child since 2018.