United Kingdom, Aug. 26 -- Bruce Willis' brain is "failing him".

The Die Hard star, 70, was diagnosed with frontotemporal dementia in 2023 and his wife Emma Heming Willis has revealed that the star is declining cognitively, even though he continues to be in "great health overall".

In a preview clip from the forthcoming ABC special Emma and Bruce Willis: The Unexpected Journey, Emma said: "Bruce is still very mobile. Bruce is in really great health overall, you know. It's just his brain that is failing him."

The 47-year-old model explained that Bruce - who retired from acting in 2022 after being diagnosed with the health condition aphasia - is losing his communication abilities.

Emma said: "The language is going, and, you know, we've l...