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That '70s Show lives on with That '90s Show, which picks up almost 20 years after the original show ended. Unfortunately, in that time span, a beloved character died off-screen. As noted from a couple of lines of dialog from Kitty Forman (Debra Jo Rupp), her mom, Bea Sigurdson, died between the shows' two time periods. Bea was played by the late TV icon Betty White, who died on Dec. 31, 2021, in four memorable episodes of the original show.