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

No cause of death has been released as Nippard’s team asks for privacy.

Overview

  • An announcement posted March 6 on Jeff Nippard’s Instagram by his social-media team said Buttermore’s passing was sudden and noted their 10-year relationship.
  • Buttermore held a PhD in pathology and cell biology from the University of South Florida and researched ovarian cancer, including early detection markers such as RHAMM.
  • She built a large audience with evidence-based fitness and nutrition content, amassing over one million YouTube subscribers and more than half a million Instagram followers.
  • In 2024 she stepped back from posting to focus on her well-being, later writing that her mental health had become the best it had ever been after leaving social media.
  • Recent public moments included a Valentine’s Day photo shared on Feb. 14 and her Feb. 25 birthday, as tributes from fans and fellow creators now fill Nippard’s recent posts with comments enabled.