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When Emma Heming Willis sensed something was off with Bruce Willis, she first thought it was his hearing loss from "Die Hard."

The former model has written a new book, "The Unexpected Journey: Finding Strength, Hope, and Yourself on the Caregiving Path." It’s centered on her personal experience as a caregiver for her husband, who was diagnosed with frontotemporal dementia (FTD). It also serves as a roadmap for new caregivers.

"When Bruce was shooting the first ‘Die Hard,’ he shot a gun underneath a table multiple times, and they didn’t have him wear any kind of ear protection," the 47-year-old told Fox News Digital. "That took out a huge percentage of his hearing. And over time, for all of us as we age, our hearing starts

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