Brandon Blackstock, the ex-husband and former manager of pop star Kelly Clarkson, has died after a three-year battle with cancer. He was 48 years old.

The news was confirmed Thursday by Blackstock’s management company.

Clarkson announced late Wednesday night that she was postponing the August dates of her Las Vegas residency because of Blackstock’s illness, adding she needs "to be fully present" for their children.

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"While I normally keep my personal life private, this past year, my children’s father has been ill and at this moment, I need to be fully present for them," Clarkson wrote on Instagram Wednesday night. "I am sincerely sorry to everyone who bought tickets to the shows and I so appreciate your grace,

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