Tributes are being paid to actress Hayden Panettiere, star of the US television shows "Heroes" and "Nashville," who died on Sunday at the age of 36. The Greenville County Coroner's Office stated that the autopsy showed no signs of trauma.

Panettiere died in Greenville, South Carolina. Police reported that there were no signs of foul play or suspicious circumstances surrounding her death. While the star had spoken publicly about her struggles with substance abuse over the years, no official cause of death has been released.

Paramedics responded to a report of a woman in cardiac arrest. Audio from police dispatchers indicated that responders were dealing with a cardiac arrest and described efforts to resuscitate the individual following a possible overdose. The coroner's office confirmed that advanced cardiac life support measures were initiated but resuscitation efforts were unsuccessful.

Panettiere's father, Skip, announced her death, stating, "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." He requested privacy for the family during their time of grief.

Known for her role as cheerleader Claire Bennet in "Heroes" and country singer Juliette Barnes in "Nashville," Panettiere began her acting career as a child. Her early notable roles included appearances in the films "Remember the Titans" and "Raising Helen," as well as a starring part in "Bring It On: All or Nothing."

Fellow actors and industry professionals have shared their memories of Panettiere. Oscar winner Viola Davis, who acted alongside Panettiere in the 2016 film "Custody," described her as an "amazing talent" and "so gifted." Bryan Fuller, a writer and producer for "Heroes," remembered Panettiere as "more than an actress, she was a muse," adding that she was "wise beyond her years."

The Greenville Police Department confirmed officers were dispatched to a report of an unresponsive female on Sunday afternoon. Medical assistance was provided at the scene, but the individual, later identified as Panettiere, was pronounced deceased. The preliminary investigation has not pointed to any foul play or suspicious circumstances, according to the department.

Details regarding the circumstances of her death remain limited, with the official cause pending further investigation. The focus has largely been on tributes and acknowledgments of her career and talent.