The FBI agent who investigated harassing emails to a Florida socialite, a probe that set off a chain of events leading to the resignation of CIA director David Petraeus over an extramarital affair, was a veteran investigator who has worked on high-profile terrorism cases.
The agent was identified as Frederick Humphries by a former federal agent, a source familiar with the Petraeus investigation and Humphries' attorney, Lawrence Berger.
Humphries, 47, received the initial complaint from Jill...
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