Conversation so far:
What did Art Donovan do when he left the nfl?
He published an autobiography, Fatso, in 1987.
Was Art Donovan's autobiograpghy a hit?
What did Art Donovan do after the autobigraphy was published?
Donovan also appeared ten times on the Late Show with David Letterman

Question: Did he ever become a sports announcer?
Self-contained rewrite: Did Art Donovan ever become a sports announcer?