- Stephanie Buttermore — scientist, YouTuber and fiancée of Jeff Nippard — died suddenly at age 36; her partner announced her passing and asked for privacy.
- No cause of death has been released publicly; officials and family have not shared further details.
- Buttermore was a PhD researcher in biomedical sciences and a prominent voice for body-positive, evidence-based fitness content.
What’s been confirmed so far
Jeff Nippard announced the news on social media, describing the loss as sudden and asking fans to respect the family’s privacy.
Major outlets and industry pages have published tributes outlining her scientific work, fitness channel and outreach that built a large online community.
Who Stephanie Buttermore was — quick profile
Buttermore earned a PhD and did research in cancer biology while building a global audience for science-driven fitness and nutrition education.
Her “All In” recovery and body-image work inspired many followers who credited her with helping reshape their relationship to food and training.
Her relationship with Jeff Nippard (short)
Jeff Nippard — the popular fitness YouTuber and bodybuilder — was her long-time partner; the couple announced their engagement in 2022 and publicly celebrated milestones together.
What we do not know yet — important caveats
No official cause of death has been released; any social-media speculation about reasons is unverified and may be harmful.
Medical or coroner reports (if and when released) will be the authoritative sources for cause and manner of death — treat early reports with caution.
Community reaction and legacy
Tributes have poured in from fans, fellow creators and academics who praised her warmth, scientific rigor and openness about mental-health struggles.
Her work on women’s health, intuitive eating and evidence-based training is widely cited across the fitness community.
Short FAQ — readers’ quick questions
How did Stephanie Buttermore die?
As of reporting, the cause of death has not been disclosed; family and police statements have not provided further details.
How old was she?
She was 36.
Was she married to Jeff Nippard?
No — they were engaged; Jeff Nippard announced her passing on social media.
Disclaimer & sensitivity note: This article summarizes breaking reports as of March 2026. Because the cause of death has not been disclosed, we avoid speculation. If you are affected emotionally by this news, please reach out to trusted friends, family or local support services.