According to the official death certificate obtained by People Thursday, seizures were listed as “significant conditions contributing to death but not resulting in the underlying cause.” Kelly Clarkson’s ex-husband’s official cause of death was listed as malignant melanoma.

Per the document, Blackstock died of natural causes at 11:13 a.m. at his Butte, Mont. home — no autopsy was performed, and Blackstock was cremated. His occupation was listed as a rodeo industry rodeo producer.

A rep for Clarkson did not immediately return Page Six’s request for comment.

Brandon Blackstock in a cowboy hat.
Brandon Blackstock’s death certificate revealed he suffered from seizures prior to his August 7 death. He’s seen here with his son Seth.@sethblackstock/Instagram

Brandon Blackstock and Kelly Clarkson pose for a photo.
Seizures were listed as “significant conditions contributing to death but not resulting in the underlying cause,” according to the document obtained by People.Instagram/@kellyclarkson
Blackstock battled the aggressive form of skin cancer for three years before succumbing to the condition on August 7 at the age of 48.

“It is with great sadness that we share the news that Brandon Blackstock has passed away,” a family rep told Page Six at the time.

“Brandon bravely battled cancer for more than three years. He passed away peacefully and was surrounded by family. We thank you for your thoughts and prayers and ask everyone to respect the family’s privacy during this very difficult time.”

A source also confirmed to Page Six that the father of four had been in hospice prior to his passing.

His former wife, with whom he shared kids River, 11 and Remington, 9, announced for the second time the cancellation of some of her Las Vegas residency shows on the eve of his death.

Brandon Blackstock and Kelly Clarkson smiling.
Blackstock’s official cause of death was malignant melanoma.Instagram/@kellyclarkson

Brandon Blackstock on a horse.
His occupation was listed as rodeo industry rodeo producer.@sethblackstock/Instagram

Reba MacEntire and Brandon Blackstock.
Blackstock is the former stepson of Reba MacEntire.Instagram/@reba

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Brandon Blackstock and Kelly Clarkson at an event.
Blackstock, who was married to Kelly Clarkson for nearly 7 years, died on August 7.FilmMagic

Brandon Blackstock with two children on his lap.
They shared children River and Remington.Instagram/@kellyclarkson