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Brandon Blackstock, a talent manager and Kelly Clarkson's ex-husband, has died; he was 48

Blackstock was dad to four children: Savannah, Seth, River and Remington

Before his death, Clarkson revealed in an Aug. 6 Instagram post that "this past year, my children’s father has been ill," adding that she would be taking time to focus on River and Remington

Brandon Blackstock , a talent manager known as both the ex-husband of Kelly Clarkson and the former stepson of Reba McEntire , has died. He was 48.

"It is with great sadness that we share the news that Brandon Blackstock has passed away," a rep for the family tells PEOPLE in a statement. "Brandon bravely battled cancer for more than three years. He passed away peacefully and was surrounded by family. We thank you for yo

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