UPDATE: Cheryl Strayed is facing the unimaginable.

The Wild author shared that her husband Brian Lindstrom died on May 15 following a private health battle with Progressive Supranuclear Palsy, a rare brain disease that arises from the damage of cells that control body movement, according to the Mayo Clinic.

“Brian Lindstrom died this morning the way he lived—with gentleness and courage, grace and gratitude for his beautiful life,” Cheryl wrote on Instagram on May 15. “Our children, Carver and Bobbi, and I held him as he took his last breath and we will hold him forever in our hearts.”

“The only thing more immense than our sorrow that Progressive Supranuclear Palsy took our beloved Brian from us,” she added, “is the endless love we have for him.”

“We do not know how we will live without him,” she continued. “We’re utterly bereft. We can only walk this dark path and search for the beauty Brian knew was there. It will be his eternal light that guides us.”

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Cheryl Strayed has some difficult news.

The author—whose memoir Wild was adapted into Reese Witherspoon’s 2014 film of the same name—shared that her “beloved” husband of 25 years Brian Lindstrom has been diagnosed with an undisclosed “serious, fatal illness.”

In light of the news, Cheryl—who shares two children with Brian—explained she would be cancelling several upcoming workshops and events.