Sagal, 70, and Jack's son, Jackson White, announced the news on Tuesday, July 16, paying tribute to the musician.
"This guy taught me everything," Jackson, 28, shared on Instagram.
We had ups and downs, as any father and son do. But in the end, it was just love.
He was an open book, a fighter, genuinely the funniest person my sister and I knew, and he single-handedly invented the loudest, most powerful backbeat of any drummer I've ever seen."
Jackson mentioned that his dad is "not in pain anymore." He added, "And we get to remember him, 6 foot 4 with a denim shirt and a Starbucks muffin, driving us around, teaching us every important song ever written."
Jackson shared that he'll be wearing Jack's shoes daily. "Not a metaphor, he had really cool shoes," Jackson explained. "Big Jack White. 1954-2024. I love you dad forever."