Stephanie Buttermore, a cancer researcher who achieved acclaim while maintaining her status as a recognised fitness influencer, died at the age of 36. The tragic news was confirmed on Friday, March 6, 2026, by her fiancé of ten years, Canadian bodybuilder Jeff Nippard.
Nippard announced Buttermore’s passing in an emotional statement shared on Instagram, expressing “profound sorrow” and remembering her as someone who “meant the world” to him. He requested privacy for himself, Buttermore’s family, and the broader fitness community as they mourn her sudden loss. The official cause of death remains undisclosed at this point.
Buttermore built her YouTube channel to over 1 million subscribers by using scientific methods to create her fitness programs, which she shared with her audience through her health advice and her All In eating demonstration. Beyond her online presence, she was a dedicated scholar, holding a PhD in Pathology and Cell Biology from the University of South Florida, with a research focus on ovarian cancer.
Buttermore left social media in May 2024 because she needed to protect her mental health after facing “crippling” anxiety. She maintained a low public profile, yet her presence continued to make an impact throughout both the scientific and fitness communities.
The couple had been together for ten years when they became engaged, and they shared their final public image on Valentine’s Day 2026. The outpouring of condolences from fans and fellow creators underscores the depth of Buttermore’s impact, both as a fitness educator and as a mental health advocate.
The fitness community mourns the loss of a trailblazer whose legacy will endure through her research, educational content, and compassion for others.
