Hayden Panettiere's ex-partner is grieving her death, expressing profound sadness. The two had a child together, an 11-year-old daughter named Kaya.

The couple's daughter is now 11 years old, and her parents' relationship has ended in tragedy with her mother's passing.

Further details about Hayden Panettiere's death and her ex-partner's reaction can be found through other news sources, including the original report.