The ‘Miss Independent’ artist filed for divorce in 2020 after she and Brandon quarantined together at their Montana ranch during the COVID-19 pandemic.

Brandon Blackstock learned he had cancer after his divorce from Kelly Clarkson, sources tells PEOPLE exclusively, then moved back to Montana following his diagnosis. The former music manager died in Thursday,

After they split up, Kelly Clarkson and Brandon Blackstock reportedly continued to co-parent their two children — River Rose (11) and Remington Alexander (9). Now, an insider alleges to Us Weekly that the process wasn’t always easy for the singer and talk show host.