Willis was diagnosed first with aphasia -- a condition where the brain's ability to understand or express language is impaired, according to the National Institutes of Health -- in 2022 before receiving an additional diagnosis of frontotemporal dementia in 2023, according to his family.

The documentary "Susan" follows a woman living with frontotemporal dementia and her advocacy for others with the disease, highlighting the emotional impact on her family and their efforts to continue her legacy.

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In an Instagram post shared by his wife Emma Heming Willis on Thursday, Willis can be seen shaking hands with a Los Angeles police officer.