David10086 said: "Didn’t he play Billy Flynn in CHICAGO in the early 2000s ? Or am I mixing him up with another game show host from back then? It may have been on tour. So much stunt casting I can’t keep up!"
According to ibdb.com, his only three Broadway appearances were in How To Make a Man, Skyscraper and La Cage Aux Folles. Maybe he did Chicago somewhere else?