Popular fitness influencer Dr. Stephanie Buttermore has died, her fiancé, YouTube star Jeff Nippard, announced Friday. She was 36 years old.

Nippard’s team shared the news of Buttermore’s death in a statement posted to Instagram, which 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.”

The statement concluded by asking fans to respect Nippard’s request for privacy.

At the time of writing, no information on Buttermore’s cause of death has been revealed.

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