Jack Hanna built the Columbus Zoo and Aquarium into one of the nation's best. He then captivated national audiences on David Letterman’s latenight talk show, "Good Morning America" and a number of his own Emmywinning animal series that still run in syndication. He traveled the globe as a leading animal conservationist promoting Columbus. It was his home for decades.

But at age 76, Alzheimer’s disease has stripped away his memory and the life he led in the public eye for almost a half century. He was first diagnosed in the fall of 2019 with early Alzheimer's but now the disease has advanced to the point where he doesn't know most of his own family.

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