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It's similar to Parkinson's disease, but the dementia doesn't happen right away. LBD can cause hallucinations, confusion and delusions among other symptoms which makes it different from Alzheimer's.

"In November of 2013, he had a little gut pain. Next month, it was another symptom," Susan Schneider said. "It was like this endless parade of symptoms."

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She says Williams didn't show signs of being suicidal but says the "chemical warfare no one knew about" was going on in his mind.

Popular radio host Casey Kasem, who died just months before Williams, was also diagnosed with LBD.

Currently, there's no cure for Parkinson's or LBD.

This video includes an image from Getty Images and Jensflorian / CC BY SA 3.0

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Former Fulton County election worker Ruby Freeman talks to her daughter, Wandrea ArShaye "Shaye" Moss, a former Georgia election worker, after she testified before the U.S. House Select Committee at its fourth hearing on its Jan. 6 investigation on Capitol Hill in Washington, D.C., on Tuesday, June 21, 2022. (Yuri Gripas/Abaca Press/TNS)

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