Man accused of blackmailing Letterman attended Tempe H.S.

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TEMPE -- The man accused of trying to blackmail David Letterman for $2 million attended Tempe High School.

Longtime CBS producer Robert Halderman graduated from Tempe back in 1976.
   
Investigators say he threatened to go public with what he knew about Letterman's sexual relationships with female staffers.

Letterman went to police and publicly apologized to his wife on his show.

Letterman insisted the affairs are over.