More details of the death of Brandon Blackstock, the talent manager and former husband of Kelly Clarkson, have come to light ahead of his Aug. 17 memorial service. A death certificate, officially filed Thursday in Butte, Montana, confirmed the 48-year-old died of natural causes related to malignant melanoma, an aggressive form of skin cancer. But the father of four, who battled cancer for ...

Brandon Blackstock and Kelly Clarkson attend the 25th Annual Critics' Choice Awards at Barker Hangar on Jan. 12, 2020, in Santa Monica, California.

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More details of the death of Brandon Blackstock, the talent manager and former husband of Kelly Clarkson, have come to light ahead of his Aug. 17 memorial service.

A death certificate, officially filed Thursday in Butte, Montana, confirmed the 48-year-old died of natural causes related to malignant melanoma, an aggressive form of skin cancer.

But the father of four, who battled cancer for three years, also suffered from seizures. They were listed as “significant conditions contributing to death but not resulting in the underlying cause,” according to the documents obtained by TMZ and People.

Blackstock died on Aug. 7 at his home in Butte while under hospice care, according to the Silver Bow County coroner, who initially confirmed the details of his cancer to People.

Though Blackstock was known for overseeing the careers of Rascal Flatts, Blake Shelton and at one time Clarkson, his death certificate listed his occupation as a producer in the rodeo industry. The documents also confirmed that an autopsy was not performed and that Blackstock was cremated.

An online obituary for Blackstock made no mention of Clarkson, but did name her former production assistant Brittney Marie Jones — referring to her his “beautiful and loving partner in life and business.”

According to Us Weekly, an insider revealed that Jones “moved to Montana” and helped Blackstock build his Valley View Rodeo in 2023.

Clarkson and Blackstock married in 2013. The couple later welcomed two children — daughter River, now 11, and son Remington, 9 — before the “Stronger (What Doesn’t Kill You)” singer filed for divorce in 2020.

Following a messy legal battle, the pair finalized their divorce in March 2022.

Prior to his relationship with the Grammy and Daytime Emmy winner, Blackstock was married to Melissa Ashworth from 2001 to 2012, with whom he shared 23-year-old daughter Savannah and 18-year-old son Seth. He was expecting his third grandchild before his death.