Fitness Influencer Stephanie Buttermore Dies at 36, Fiancé Jeff Nippard Confirms

Stephanie Buttermore, a 36-year-old fitness influencer and scientist known for her evidence-based approach and PhD research on ovarian cancer, passed away suddenly, as confirmed by her fiancé, Canadian bodybuilder Jeff Nippard, on March 6, 2026. The couple had been together for about ten years and engaged since 2022. No cause of death has been disclosed. Buttermore had stepped back from social media in 2024 due to anxiety and was widely respected in the fitness community. Nippard requested privacy as they mourn her loss.