Jill Kelley, Social Liaison, Revealed Affair Between Paula Broadwell and David Petraeus After Receiving Harassing Emails

The latest revelation in former CIA director David Petraeus' scandal over his affair is the name of the woman who brought the scandal to the attention of the FBI in the first place, Jill Kelley.

Kelley, 37, is a social liaison to the Joint Special Operations Command, a mostly secret counterterrorism organization.

Kelley is a friend of Petraeus, though it is unknown whether their relationship was more than that. However, Kelley apparently received threatening emails from Petraeus' mistress, who was identified last week as journalist and Petraeus biographer Paula Broadwell.

Broadwell allegedly told Kelley to stay away from Petraeus.

Petraeus resigned last week, after admitting to the extramarital affair.

Broadwell is the author of "All In: The Education of General David Petraeus," which was released in January of this year.

Broadwell visited Afghanistan six times to interview Petraeus, spending a total of three months embedded in a combat zone with the general.

Here she is on the Daily Show with Jon Stewart saying Petraeus isn't a "long-term strategic thinker."

Petraeus told President Obama of the affair on Thursday and tendered his resignation. Obama accepted on Friday, saying, "By any measure, through his lifetime of service, David Petraeus has made our country safer and stronger," in a statement. "Going forward, my thoughts and prayers are with Dave and Holly Petraeus, who have done so much to help military families through her own work. I wish them the very best at this difficult time."

Petraeus also released a statement, explaining his decision to resign and apologizing for his behavior.

"After being married for over 37 years, I showed extremely poor judgment by engaging in an extramarital affair. Such behavior is unacceptable, both as a husband and as the leader of an organization such as ours. This afternoon, the president graciously accepted my resignation."

Petraeus led the wars in Iraq and Afghanistan in the later years of the presidency of George W. Bush. He oversaw the "surge" in Iraq, and influx of American troops that quelled much of the insurgency and paved the way for a removal of troops under the Obama administration.

After Iraq, Petraeus moved to Afghanistan to try to repeat the maneuver, but he was unsuccessful. In 2011, Petraeus moved to the CIA, replacing Leon Panetta, who took a new post at the Defense Department.