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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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Donald Trump's administration deployed the military to Washington, D.C., in the name of fighting crime, and in an Aug. 11 news conference he mentioned the possibility of military being sent to other large American cities, all of which are led by Black, Democratic mayors. And while Atlanta wasn't included in Trump's list, the city fits that profile under Mayor Andre Dickens. (Photo Illustration: Philip Robibero / AJC | Source: Getty)

Credit: Philip Robibero