Months before her death in August 2025, Kelley Mack praised her boyfriend, Logan Lanier, for his endless support throughout her battle with a rare form of cancer. Mack announced via Instagram in January 2025 that she had been diagnosed with diffuse midline glioma (DMG), an "extremely rare type of astrocytoma cancer." At the same time, she revealed that she had recently moved in with Lanier, whom she had mostly remained quiet about until then.