Actor Bruce Willis has frontotemporal dementia, confirms his family.
They claimed it was a "relief to finally have a precise diagnosis" in a statement posted on social media.
The 67-year-old was given a more correct assessment after progressing from his initial aphasia diagnosis, which results in speech impairments, made in the spring of last year, according to the family.
They gave their "sincere thanks for the overwhelming outpouring of love."
Frontotemporal dementia is the most prevalent type of dementia in adults under 60, the family continued.
"Today there are no treatments for the disease, a reality that we hope can change in the years ahead," the statement said.
After acting in blockbuster movies like Die Hard, The Sixth Sense, Armageddon, and Pulp Fiction, Willis rose to fame in the 1980s and 1990s.
He was also nominated for three Emmys, where he won two, and five Golden Globes, including one for Moonlighting.
But, Willis' family said last year that he would stop performing since his aphasia was impairing his cognitive function.
The latest statement on Thursday expressed the hope that the actor's illness would become more widely known due to media coverage.
Family members of Willis, including his wife Emma Heming and their two daughters as well as his ex-wife Demi Moore and their three daughters, signed the declaration.
Frontotemporal dementia is a "uncommon" form of the disease that affects behavior and language, according to the UK NHS website.
Other symptoms include muscle weakness, sluggish or stiff movements, loss of bladder or bowel control (although this usually occurs later), and slow or stiff breathing.
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