Hayden Panettiere, the actress who rose to fame as the indestructible cheerleader Claire Bennett on NBC's "Heroes" and later earned acclaim as country star Juliette Barnes on ABC's "Nashville," has died. She was 36.

TMZ and ABC News first reported the news on Sunday, citing sources close to the actress. Her representative later confirmed the death in a statement to ABC News: "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."

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According to TMZ, Panettiere died on Sunday while she was with her on-again, off-again boyfriend, actor Brian Hickerson. No cause of death has been released at this time.

Panettiere's career began remarkably early; her biography from the National Academy of Television Arts and Sciences notes she started in commercials at just 11 months old. By age four, she was acting on ABC's "One Life to Live," before moving to CBS's "Guiding Light." These early soap roles laid the groundwork for a career that would span decades.

Her breakout came in 2006 when she landed the role of Claire Bennett on "Heroes," a sci-fi drama that became a cultural phenomenon. Her character's catchphrase, "Save the cheerleader, save the world," became iconic. She later transitioned to music-infused drama on "Nashville," where she played a rising country singer, earning critical praise and a devoted fan base.

Beyond acting, Panettiere was recognized for her activism. She won the 2009 Teen Choice Award for Choice Celebrity Activist for her work as a campaign spokesperson for the Whaleman Foundation, an organization dedicated to protecting ocean mammals and their habitats. She also received Teen Choice Awards in 2008 and 2009 for her action-adventure roles.

Panettiere leaves behind a daughter, Kaya, whom she shared with her former fiancé, professional boxer Wladimir Klitschko. The couple's relationship had been public and often scrutinized, but Panettiere spoke openly about her struggles with postpartum depression and her commitment to her daughter.

The news of her death has sent shockwaves through Hollywood and among fans who grew up watching her. Tributes have begun pouring in on social media, with colleagues and admirers remembering her talent and vibrancy.

As the entertainment world mourns, questions remain about the circumstances of her death. Authorities have not yet provided additional details, and an autopsy may be conducted to determine the cause.

Panettiere's legacy is one of resilience and versatility, from child star to leading lady, and her impact on television will not be forgotten. Her family has asked for privacy during this difficult time.