Hayden Panettiere, the actress who rose to prominence playing Claire Bennet in the NBC superhero series Heroes and later starred as country singer Juliette Barnes in ABC's Nashville, has died at the age of 36. Her death was confirmed on August 17, 2026, and an investigation into the circumstances surrounding it is continuing.

Panettiere began her career as a child actress and became a household name in the mid-2000s. Her role in Heroes, which aired from 2006 to 2010, earned her widespread recognition, and she later received a Golden Globe nomination for her performance in Nashville, which ran from 2012 to 2018. She was also known for her advocacy work on behalf of dolphins and for speaking publicly about her struggles with postpartum depression.

Wladimir Klitschko, the retired heavyweight boxing champion and Panettiere's former fiancé, expressed grief over her death. Klitschko, who had recently obtained custody of the couple's daughter, Kaya, issued a public statement mourning the loss. The couple had a long and well-documented relationship that ended in 2018.

Tributes from colleagues and fans began circulating across social media shortly after news of her death broke. PBS NewsHour and other outlets offered retrospectives on her life and career, reflecting on her impact as both an entertainer and a public advocate for mental health awareness. She had spoken candidly in interviews about her personal struggles, including addiction and postpartum depression, earning praise for her openness.

The cause of death has not yet been officially confirmed as the investigation remains active. Panettiere is survived by her daughter, Kaya, and her family.