Accused David Letterman blackmailer Robert Halderman will have that “accused” dropped today when he pleads guilty to extorting the late night host for $2 million. According to details of the deal obtained by the New York Post, Halderman will serve 6 months in jail and 4½ years of probation, and do 1,000 hours of community service; with credit for good behavior, his jail time will likely drop to 4 months. Halderman is expected to allocute this afternoon in New York Supreme Court. (More David Letterman stories.)