Brandon Blackstock, a talent manager and the ex-husband of the Grammy Award-winning singer and Daytime Emmy-winning talk show host Kelly Clarkson, has died. He was 48.

His death, which followed a three-year battle with cancer, was announced on Thursday in a social media post by Starstruck Entertainment, a Nashville-based talent-management company owned by Mr. Blackstock’s father, Narvel Blackstock, at which Mr. Blackstock was an executive.

The announcement of Mr. Blackstock’s death came one day after Ms. Clarkson said she would be postponing the August dates of her residency in Las Vegas, citing her ex-husband’s health and their two children.

“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,” Ms. Clarkson said in a statement shared to her Instagram on Wednesday.

Ms. Clarkson was scheduled to begin her residency, called “Kelly Clarkson: Studio Sessions,” at the Colosseum at Caesars Palace in July, but she delayed its start because of vocal issues, she said in a July Instagram post.

There were five shows scheduled for August, according to her website. The residency is scheduled to run through November.

Ms. Clarkson and Mr. Blackstock began dating in 2012 and married in Tennessee in 2013. She filed for divorce in 2020, citing “irreconcilable differences.”

Mr. Blackstock was an executive producer on “The Kelly Clarkson Show” from 2019 to 2020, according to IMDb. He also previously managed the country singer Blake Shelton. His father, who founded Starstruck Entertainment in 1988, was married to the country music star and actress Reba McEntire from 1989 to 2015.

Mr. Blackstock had two children from a previous marriage.

A full list of survivors was not immediately available.