Letterman had a friendship with staff writer Markoe, which eventually blossomed into a long-term romantic relationship, then a brief engagement, and finally, says Markoe, "a very bitter, sad, horrible breakup."
"I did not behave well at the end of that relationship," is all Letterman will say. But years later, when she wrote a book, Markoe was a welcome if awkward guest on Letterman`s show.

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