The sudden death of Hayden Panettiere at just 36 years old has stunned fans, and new details are now emerging about what happened during her final hours.

The actress, beloved for her roles in Heroes, Nashville, Remember the Titans and the Scream franchise, died Sunday, August 16, at a residence in Greenville, South Carolina.

According to authorities, police officers and emergency medical personnel responded at approximately 1:51 p.m. after receiving a report of an unresponsive woman.

An acquaintance of Panettiere reportedly made the 911 call.

Emergency Crews Tried to Save Her

When first responders arrived, they found Panettiere in cardiac arrest.

Emergency medical personnel immediately began advanced life-support measures in an attempt to revive her.

Despite those efforts, Panettiere could not be saved. She was pronounced dead at 2:32 p.m.

The Greenville Police Department has said that its preliminary investigation found no signs of foul play or suspicious circumstances surrounding her death.

Questions Remain About What Happened

Dispatch audio from the emergency response has added another layer to the developing story.

According to reports, officials can be heard referencing an “overdose” and “cardiac arrest” during communications surrounding the emergency.

However, that does not mean an overdose has been officially determined to be Panettiere’s cause of death.

Authorities have not announced an official cause, and the circumstances remain under investigation.

Until investigators and the coroner complete their work, any suggestion about precisely what caused her death should be considered preliminary.

A Career That Began in Childhood

For millions of viewers, Panettiere had been a familiar face for decades.

She began working in entertainment as a child before eventually becoming internationally recognized as Claire Bennet on Heroes.

Her career later took another major turn when she was cast as country singer Juliette Barnes on Nashville. The performance earned Panettiere two Golden Globe nominations and introduced her to another generation of television viewers.

Movie audiences also knew her from films including Remember the Titans, Raising Helen, Ice Princess and the Scream franchise.

Earlier this year, Panettiere released her memoir, This Is Me: A Reckoning, in which she looked back candidly on her life, career and personal struggles.

Hollywood Mourns

News of Panettiere’s death quickly brought an outpouring of tributes from fans and people throughout the entertainment industry.

Her family confirmed the devastating news through her representative, with her father remembering his daughter as an incredible light who brought tremendous love and joy to those around her.

Panettiere leaves behind her daughter, Kaya.

She would have celebrated her 37th birthday on August 21, only days after her death.

For now, the biggest question surrounding her sudden passing remains unanswered.

Investigators continue working to establish exactly what happened, and until an official cause of death is released, the newly reported details offer only part of the story.

What is already certain is that Hayden Panettiere’s death at only 36 has brought an unexpectedly early end to a career that began when she was just a child — and left millions of viewers remembering the characters and performances she brought to life.