Update: 9:07 a.m. One of the women that David Letterman had an affair with has been identified as Stephanie Birkitt, his former assistant, who is the current girlfriend of his extortionist, Robert “Joe” Halderman. Update: 8:49 a.m. Police identified CBS employee Robert Halderman, from Norwalk, Connecticut, as the person who tried to extort money from [...]

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