Hayden Panettiere, who is best known for her starring roles in TV shows like Heroes and Nashville, died on Sunday at age 36. She leaves behind a daughter, Kaya Evdokia Klitschko, who is 11.
In a statement to TIME, Greenville Police say that officers “responded to a report of an unresponsive female” at an address in Greenville, South Carolina, just before 2 p.m.
“Upon arrival, medical assistance was administered; however, the individual, later identified as Hayden Panettiere, was pronounced deceased at the scene,” the statement reads.
Greenville Police also confirm that “the preliminary investigation has not indicated any signs of foul play or suspicious circumstances” and that “an acquaintance of Ms. Panettiere placed the 911 call.”
Audio obtained by the New York Post reveals that first responders tried to resuscitate someone—allegedly Panettiere—with “advanced cardiac life support.” A medic can be heard saying “overdose” and then “CPR is in progress.” However, Greenville Police tell TIME that they are unable to verify the audio and say that it is “not ours.”
Her father, Skip Panettiere, confirmed the actress’s death in a statement shared with ABC News, which broke the news early Monday. “It is with profound sadness that we share the tragic passing of our beloved Hayden,” he said, describing his daughter’s passing as an “unimaginable loss.”
“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,” the statement continued.
The actress’s publicist, Kasey Kitchen, said there is “an investigation ongoing” into Panettiere’s death, according to NBC News. TIME has reached out to Kitchen for additional comment.
Tributes have been pouring in for the actress, who also voiced Dot in Pixar’s A Bug’s Life in 1998.
Academy Award winner Viola Davis, who starred alongside Panettiere in the 2016 drama Custody, described her as “an amazing talent,” in a post on social media.
“I wish the world had more time with you because I had a burning curiosity about who you were becoming,” said Davis. “Your tests became your testimony, and your testimony became your legacy. You will be remembered. Rest well, Hayden.”
Actress Bethany Joy Lenz, a longtime friend, said that she was “crushed” in a post on social media. “I’m here with my head in my hands and I don’t know what else to do in aside from praying for her soul,” she said.
“Her intelligence was astonishing. She understood scenes and nuance and human struggle like no child I’d ever seen on camera,” Lenz continued. “These are moments of how I knew you, in glimpses over 26 years. I don’t know how to process this,” she said alongside images of the two together.
Rosie O’Donnell simply posted: “Oh my god – heartbroken.”
Actress Taryn Manning described Panettiere as “such a sweetheart- so rad – down to earth, kind, and consistently the same every time I saw her,” in a tribute on Instagram.