Brandon Blackstock and Kelly Clarkson at an event in Santa Monica, Calif., in 2020. (Frazer Harrison/Getty Images)Brandon Blackstock, Kelly Clarkson's ex-husband, was in a "loving" relationship with Brittney Marie Jones, her former production assistant and his executive assistant, at the time of his death, according to an obituary shared online by his family.Blackstock died on Aug. 7 at his home in Butte, Mont., after a three-year battle with melanoma, a form of skin cancer.The obituary describes Jones as Blackstock's "beautiful and loving partner in life and business.