Hanna was officially diagnosed with Alzheimer's in 2019, and retired from the zoo in 2020, shortly after his final stage performance with animals. "He would have worked until the day he died.

Jack Hanna's family shared an update on the famed zookeeper and TV host's health. They said Hanna 'continues to decline' amid his battle with Alzheimer's disease.

Jack Hanna and his family are in the midst of a “long goodbye.” The former zookeeper, beloved animal expert and television personality is now living with advanced Alzheimer’s disease, which ...

Hanna, who was director of the Columbus Zoo from 1978 through 1992, became a national celebrity for appearing on talk shows with animals and starring in his own weekly animal television series.