Brittney Jones moved to Montana to work for Blackstock's ranch the same month Clarkson filed for divorceNEED TO KNOWBrandon Blackstock's partner Brittney Marie Jones previously worked as Kelly Clarkson's production assistant,

Kelly Clarkson's ex-husband, Brandon Blackstock, has passed away after a three-year cancer battle, his family said in a statement. The Silver Bow County Coroner, Dan Hollis, confirmed to TODAY.com that Blackstock's cause of death was melanoma and the manner of death was natural causes.