Hayden Panettiere's preliminary autopsy released: What it says

"Nashville" and "Heroes" star Hayden Panettiere’s preliminary autopsy results were released on Monday and found no signs of trauma contributed to her death. 

Hayden Panettiere's preliminary autopsy revealed

What we know:

"First responders and Emergency Medical Services arrived on scene and located a female in cardiac arrest," the Greenville County Coroner’s Office said in a statement. "EMS personnel initiated advanced cardiac life support measures; however, resuscitation efforts were unsuccessful, and the individual was pronounced deceased at 2:32 PM."

The Greenville County Coroner’s Office and Greenville City Police Department launched parallel investigations into her death.

"At autopsy no signs of trauma were discovered that would have contributed to the death," the coroner's statement continued. "The cause and manner of death remain pending further investigation and the completion of additional studies."

"This investigation remains active and ongoing. No further details are available for release at this time."

A preliminary investigation into the death of Hayden Panettiere found no signs of foul play or suspicious circumstances, according to police.

What we don't know:

An official cause of her death has not yet been released. 

Hayden Panettiere dies Sunday

Timeline:

Panettiere died on Sunday, a day after departing from Los Angeles on a plane with Brian Hickerson, TMZ reported. 

RELATED: Hayden Panettiere's friends and former co-stars share tributes

"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," Panetierre’s representative told ABC News.

Officers and emergency medical personnel responded to a report of an unresponsive woman at the Judson Mill Lofts in Greenville, South Carolina, shortly before 2 p.m. Sunday, the Greenville Police Department said in a statement obtained by The Associated Press.

Life-saving measures were performed, but Panettiere was pronounced dead at the scene, according to the statement.

Police said an acquaintance of the 36-year-old actress called 911 from the apartment complex.

Hayden Panetierre's legacy

The backstory:

In addition to her roles as Claire Bennet on "Heroes" and Juliette Barnes on "Nashville," Panettiere was also in "Remember the Titans" and, "I Love You, Beth Cooper" as well as "Scream IV" and "Scream VI," among dozens of other credits. 

The winner of three Teen Choice Awards, a Grammy Award nominee and a three-time Golden Globe nominee, Panettiere did her own singing on "Nashville" playing opposite Connie Britton for four seasons on ABC. 

The screen actor's union released a statement saying, "We join in mourning the sudden passing of Hayden Panettiere," SAG-AFTRA said. "Our hearts are with her daughter, family, ‌friends ⁠and fans."

She released a memoir in May, opening up about the custody arrangement involving her 11-year-old daughter, who lives in Ukraine with her father, former heavyweight boxing champion Wladimir Klitschko. In the book, she also discussed her struggles with alcohol addiction and depression.

Panettiere's younger brother, Jansen, died of a heart condition in 2023. He was 28.

This is a developing story. Check back for more updates.