Jack Hanna, who became famous for appearing on talk shows with animals by his side, has reached an advanced stage of Alzheimer's, his family said. Hanna, 77, served as director of the Columbus Zoo ...

RELATED: Former Columbus Zoo Director Jack Hanna, 74, Diagnosed with Dementia, Family Shares in Letter Adam Cairns/Columbus Dispatch / USA TODAY NETWORK Hanna, also known as "Jungle Jack," served ...

The zoo is collecting letters to send to the Hanna family. People close to the family says going to the mailbox is one of Jack’s daily activities he enjoys.

COLUMBUS, Ohio – Celebrity zookeeper and animal TV show host Jack Hanna has been diagnosed with dementia and will retire from public life, his family said. In a news release Wednesday ...