May 2012: Jill Kelley, the woman who helped spark the FBI investigation, has been described as a Petraeus family friend and married Florida socialite (see a photo of her and her doctor husband). According to some reports, Kelley was not having an affair with Petraeus. But in May, she received several harassing anonymous emails, that some reports say accused her of having an affair. Kelley asked a friend in the FBI for help.
Summer 2012: The FBI learned that Broadwell had sent the emails to Kelley and also found emails sent by Broadwell and Petraeus that revealed their affair, which they ended in July.
Fall 2012: The FBI interviewed both Broadwell and Petraeus, who admitted to the affair. Because it was determined to be a private issue and not a national security concern or criminal matter, congressional intelligence committees weren’t notified of the investigation.