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Jack Hanna has been diagnosed with dementia, now believed to be Alzheimer's disease, Hanna's three daughters announced in a letter published Wednesday.

Hanna, the 74-year-old internationally known director emeritus of the Columbus Zoo and Aquarium, has spent more than four decades in the public eye putting Columbus and its zoo's conservation efforts on the national stage. He officially retired from his role as the zoo's spokesperson in December 2020.

Now, Hanna's daughters — Kathaleen, Suzanne and Julie — say their dad is unable to participate in public life like he once did as his condition has severely worsened in the last few months.

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While Dad's health has deteriorated quickly, we can assure you that his great sense of humor continues to shine through. And yes - he still wears his khakis at home.