Celebrity zookeeper Jack Hanna diagnosed with dementia

Jack Hanna’s family announced that the animal TV show host has been diagnosed with dementia and will retire from public life. His family added he has Alzheimer’s disease that has progressed quickly.
1:23 | 04/07/21

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Transcript for Celebrity zookeeper Jack Hanna diagnosed with dementia
Finally tonight, his love of animals still inspires us all. For decades, millions of Americans have welcomed him and his love of animals into their homes. Hi, everybody, I'm jack Hanna. Jack Hanna would introduce the world to the animals he fought so hard to save. Jack, are you -- Late night TV with the baby tigers. I'll take jack Hanna for the block please, Tom. All right, jack Hanna. On "Hollywood squares." That's a sloth. Oh, okay. On "Gma" with Charlie and Diane. Diane's a good sport. Jack Hanna on land, at sea, always connecting, always teaching, always with a focus on conservation. The turtles. There you go! The grizzly bears. The joy I had of seeing that bear free again. And tonight, his daughters now revealing their father has dementia, they believe Alzheimer's. He is now 74 and they write, he spent his life connecting people and wildlife because he has always believed having people see and experience animals is key to engaging them in more impactful conservation. He always said, you have to touch the heart to teach the mind. We are thinking about jack Hanna tonight and the animals.

This transcript has been automatically generated and may not be 100% accurate.

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