Suspect in Letterman's Extortion

No one’s laughing here: TMZ is reporting that the suspect in the $2 million extortion plot against David Letterman is Robert Halderman, a “well-respected” producer for 48 Hours. Until recently, Halderman was living with his girlfriend Stephanie Birkitt, Letterman’s former assistant. Letterman disclosed on the air last night that he had sexual relations with female members of his staff. TMZ says one of those woman was Birkitt, and that their relationship ended when Letterman’s son was born in 2003.