Amid Bruce Willis' nearly three-year battle with dementia , the actor's brain is "failing him," and his ability to communicate is fading, according to his wife Emma Heming Willis .

"Bruce is still very mobile. Bruce is in really great health overall, you know," Heming Willis told ABC News' Diane Sawyer in the ABC special "Emma & Bruce Willis: The Unexpected Journey," a preview of which aired Tuesday on " Good Morning America ." "It's just his brain that is failing him."

American actor Bruce Willis and his wife American model Emma Heming attend CocoBaba and Ushopal activity on November 4, 2019 in Shanghai, China. Photo by VCG/VCG via Getty Images

Willis' family shared publicly in 2023 that he had been diagnosed with frontotemporal dementia, a type of dementia that impacts

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