Letterman Extortionist Robert Halderman


9/2/2010 7:35 AM PDT BY TMZ STAFF
David Letterman's blackmailer Robert Halderman is out of a New York City jail after serving four months behind bars.

The former CBS News producer got two months knocked off his sentence for good behavior. Halderman pled guilty to extortion after demanding $2 million from Letterman to keep quiet about the "Late Show" host's extramarital affair.

Halderman still has to do 1,000 hours of community service.