Joe Halderman sentenced to six months in prison for attempted grand larceny after threatening to expose talk-show host's affair with staffer.By Gil Kaufman David Letterman Photo: Ray Tamarra/Getty Images David Letterman breathed a sigh of relief on Tuesday after former CBS News producer Robert "Joe" Halderman pleaded guilty to attempted grand larceny in a Manhattan courtroom. Shortly after the plea was announced, the "Late Show With David Letterman" host released a statement in which he praised prosecutors, saying, "When they became involved with this case, I had complete faith that a just and appropriate result was inevitable.