Late Show With David Letterman
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Animal expert Jack Hanna has dementia, 'no longer able to travel and work in the same way'
Hanna made regular TV appearances on the "Late Show With David Letterman" and many other shows.
2 min read - NewsYahoo TV
David Letterman Reveals How His Boss (and Makeup Person) Took the Retirement News
After 32 years, David Letterman is retiring from the late-night game. Yesterday’s announcement (he will stick around until 2015) was a surprise that inspired plenty of gushing tributes from famous fans, from Jimmy Kimmel to President Obama. But not everyone was so kind.