Carrie Underwood is speaking out following the tragic death of her frequent collaborator Brett James .

On Thursday (September 18), the Grammy-winning country music songwriter died in a small-engine plane crash in Franklin, North Carolina. He was 57-years-old.

The day after his death, Carrie , 42, took to Instagram to mourn Brett .

“Some things are just unfathomable. The loss of Brett James to his family, friends and our music community is too great to put into words,” Carrie wrote along with several photos of she and Brett throughout the years.

“Brett was the epitome of ‘cool.’ I see him in my mind riding up to my cabins to write on his motorcycle…his hair somehow perfectly coiffed despite being under a helmet for however long,” the American Idol winner continued. “

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