Fitness Influencer Stephanie Buttermore Dies at 35; Jeff Nippard’s Fiancee’s Cause of Death Not Yet Disclosed

Scientist-turned-fitness influencer Stephanie Buttermore, who was engaged to Canadian bodybuilder and YouTuber Jeff Nippard, has passed away at the age of 35. The news of her death was confirmed through a statement shared on social media by Nippard on March 6, 2026.

Buttermore had been largely absent from social media for nearly two years, which had already sparked concern among her followers. For someone who had built a large audience online through her fitness and lifestyle content, such a long disappearance raised questions among fans about her well-being.

Death Confirmed by Jeff Nippard’s Team

According to a statement released by Nippard’s team, Buttermore’s passing was confirmed while requesting privacy for the family during this difficult time. The couple had been together for around a decade, and the statement emphasized her kindness, intellect, and the impact she had on those around her.

The statement read:

“It is with profound sorrow that we share the sudden passing of Jeff’s fiancée and partner of ten years, Stephanie. As many of you know, Stephanie meant the world to Jeff. She will be remembered for her warmth and compassion, her love for her family, and her PhD research on ovarian cancer.”

As of now, no official cause of death has been publicly disclosed.

Fans Recall Her Social Media Hiatus

Following the announcement of her death, many fans revisited Buttermore’s last social media posts. Her most recent Instagram update dated back to April 2024, where she discussed the benefits and challenges of stepping away from social media.

In that post, she opened up about her mental health struggles and revealed that she had been dealing with severe anxiety. According to her, the anxiety had become so intense that it sometimes made it difficult for her to breathe or even leave her home. However, she also mentioned that taking a break from online platforms helped improve her mental health and overall well-being.

From Scientist to Influencer

Before becoming a well-known figure in the fitness world, Buttermore had already built a strong academic career. She earned her PhD from the University of South Florida in pathology and cell biology, where her research focused on the molecular mechanisms behind ovarian cancer.

Despite her success in academia, she eventually chose to pursue her passion for fitness and education on social media. Through her content, she shared evidence-based fitness advice and documented her personal health journey, gaining a loyal audience worldwide.

One of her most widely discussed projects was her “All-In” journey, where she spoke openly about restrictive dieting, extreme hunger, and allowing her body to reach a natural weight. Her transparency resonated with many viewers, particularly women facing similar struggles with hormonal health and eating habits.

Career and Influence

By blending scientific knowledge with personal experience, Buttermore built a strong online presence and became an influential voice in the fitness community. Her YouTube channel and educational content attracted millions of viewers, and by 2019 her estimated net worth had reportedly reached around $500,000.

However, her extended break from social media affected her online activity and earnings, although she continued to maintain a presence through earlier content and collaborations.

Cause of Death Remains Unknown

While tributes from fans and followers continue to pour in across social media, the circumstances surrounding Buttermore’s death remain unclear. No official details about the cause of her passing have been released at this time.

Her supporters continue to remember her not only for her work in the fitness space but also for her contributions to science and her openness about personal health struggles.