Petraeus Sex Scandal: FBI Agent Who Launched Investigation ID'd

The identity of the veteran FBI agent who took the first steps in the Petraeus investigation is revealed.
3:00 | 11/15/12

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Transcript for Petraeus Sex Scandal: FBI Agent Who Launched Investigation ID'd
Let's get right to the cia sex scandal and the breaking news overnight about the veteran fbi agent who took the first investigative steps that would lead to the downfall of cia director, david petraeus. Brian ross has been following this story. Good morning. Reporter: Good morning, amy. The identification of the agent overnight was another piece of the petraeus case puzzle falling into place. It was last may when tampa socialite jill kelley began to get a series of e-mails that made her think someone was stalking her and her friend, cia director david petraeus. So, kelly went to an fbi she knew personally. 47-year-old fred humphries, whose lawyer tells abc news, humphries was the agent who helped launch the investigation and later went to congress when he thought there was a cover-up. If we hadn't had an individual who apparently believed in right and wrong with no gray, we may never have gotten to where we are in this case today. Reporter: The fbi did not tell the white house about petraeus' affair with his biographer, paula broadwell, until the day after the election, even though agents knew about it a month earlier. Fbi director, robert muller, went to capitol hill wednesday, to defend the bureau's handling of the case. At the same time, the president saying he has full confidence in the fbi but is waiting for a full explanation. I am withholding judgment. Reporter: Even as fbi agents continue to investigate the classified documents found in the computer of petraeus' mistrem mistre mistress, the president said he had no evidence of a security lapse. I have no evidence, that i have seen. Reporter: But the department of defense has revoked the his home was dark last night. Sir, abc news? Reporter: Adding another bit of spice to the soap opera in tampa, reports that humphries sent a pic of himself shirtless to jill kelley. Attorney said it was a joke between friends. He was pretending to be a fourth dummy, his lawyer says. And that he had no romantic connection with jill kelley, george.

This transcript has been automatically generated and may not be 100% accurate.

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