David Letterman's extortionist is headed to the slammer -- Robert Halderman was just sentenced to six months behind bars for trying to squeeze $2 million out the "Late Show" host.
Halderman -- who pled guilty to attempted grand larceny back in March -- just appeared in Manhattan Criminal Court in handcuffs.
Halderman will also have to serve 1000 hours of community service and will be on probation for five years.
David Letterman's Extortionist Gets Six Months
5/4/2010 3:25 PM PDT BY TMZ STAFF
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