Jack Hanna's family shares heartbreaking update on his Alzheimer's progression.

Jack Hanna's family has revealed that the zookeeper and media personality's Alzheimer's disease has progressed to the point where he doesn't recognize most of his family. Hanna, who first showed symptoms of the disease in 2017, was officially diagnosed in 2019 and retired from the zoo in 2020. There is no cure for Alzheimer's, but there are treatments such as medication, which Hanna's family says he takes to help combat symptoms. This year, an experimental Alzheimer's drug by Eli Lilly, donanemab, showed 35% less decline in thinking skills in patients receiving the infusions.