Stephanie Buttermore Cause of Death: Fitness Influencer and Cancer Researcher Dead at 36
The fitness and wellness community is mourning the sudden loss of Stephanie Buttermore, the popular YouTube personality, body positivity advocate, and ovarian cancer researcher who died on March 6, 2026, at just 36 years old. Her fiancé, Canadian bodybuilder and fitness YouTuber Jeff Nippard, confirmed the devastating news the following day.
Stephanie Buttermore Cause of Death Remains Undisclosed
The cause of death for Stephanie Buttermore is not clear. No official explanation has been shared publicly.
Jeff Nippard's team announced the tragic news on Instagram, but the statement did not disclose the cause of her death. The family appealed to the online community to respect their privacy during this time of grief.
As of now, the cause of Stephanie Buttermore's death remains unclear. Her family has asked for privacy during this difficult time.
Jeff Nippard's Heartbreaking Announcement
Nippard's team posted an "important announcement" on Instagram and YouTube, made with "profound sorrow." The announcement described Buttermore's death as "sudden."
The post read: "It is with profound sorrow that we share the sudden passing of Jeff's fiancée and partner of 10 years, Stephanie. She will be remembered for her warmth and compassion, her love for her family, and her PhD research on ovarian cancer. We kindly ask for privacy as we navigate this tragic loss."
Buttermore had just been seen publicly two weeks before her death. Nippard shared a Valentine's Day photo of the two sitting on a couch together. Buttermore commented on the post, "Love you forever" — words that would become her final public message.
Who Was Stephanie Buttermore
Stephanie Buttermore was a fitness influencer and doctor who researched ovarian cancer throughout her career. She gained major prominence through her "All In" challenge, where she ate upward of 10,000 calories per day to promote healthy weight gain for women and body positivity.
She completed her PhD in Pathology and Cell Biology at the University of South Florida. Her research focused on ovarian cancer detection and early screening, where she discovered a protein called RHAMM — one that could potentially serve as an early screening marker for the disease through a urine test.
Before stepping away from social media, Buttermore had amassed over one million subscribers on YouTube and more than 500,000 followers on Instagram.
Why Stephanie Buttermore Quit Social Media Before Her Death
Buttermore took a step back from social media in 2024 to focus on her mental health. In her final Instagram post from May 2024, she wrote that her anxiety had once been "almost crippling" to the point she felt she couldn't breathe or leave her house — but that stepping away from social media had largely resolved those struggles.
Despite taking a break from posting content, her fans continued to support her, and she had reportedly been planning a return to the platform before her passing.
Tributes Pour In for Stephanie Buttermore
Nippard's Instagram and YouTube accounts shut off comments on posts announcing Buttermore's death, but fans flooded the comments on his Valentine's Day post to show support. Fellow influencer Buff Bunny wrote, "Heaven gained an amazing angel. Someone who cared so deeply for others. Praying for you Jeff and her family."
Fans also rushed to Buttermore's own page to share stories about how the former bodybuilder helped them in their own health and weight loss journeys, celebrating the lasting impact she had on her community.
The Stephanie Buttermore cause of death has not been officially confirmed, and the family's request for privacy continues to be honored. The fitness world remains in mourning as tributes continue to grow in her memory.
