Bruce Willis' family announced he would step away from acting in 2022; the actor was diagnosed with frontotemporal dementia (FTD) in 2023

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.

Last month, Bruce's ex-wife, Demi Moore, gave an update on his well-being amid his battle with dementia. In an interview with CNN, the 62-year-old actress explained that the actor is "in a very stable place," but it hasn't been easy watching him struggle.

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.