Mrs Broadwell is a Harvard University research associate and PhD candidate at King's College, London.
Mr Petraeus quit after his affair with biographer Paula Broadwell was discovered during an FBI investigation.
When the FBI investigated, it traced the emails to an apparently jealous Mrs Broadwell.
During the investigation the FBI obtained Broadwell's computer and discovered she had classified materials.
Agents first interviewed Petraeus the week of Oct. 28, and he admitted his affair with Broadwell.
FORBES: David Petraeus: Everything You Need To Know About The Scandal
Would the investigation have stopped at the discovery of Paula Broadwell as the anonymous email sender?
Late on Monday the FBI carried out a search of Mrs Broadwell's home in Charlotte, North Carolina.
They matched the places, including hotels, where Ms. Broadwell was during the times the emails were sent.
She wouldn't show me the e-mails that she received anonymously from Broadwell, which Kelley described as threatening.
Last week Mrs Broadwell wrote a piece for Newsweek entitled General David Petraeus's Rules for Living .
We were here when the first agents showed up at Paula Broadwell home, not leaving until they come out.
FORBES: FBI Search of Paula Broadwell's Home Live-Tweeted by Local News Reporter
She is married to radiologist Scott Broadwell and lives in Charlotte, North Carolina.
Ms. Broadwell allegedly used a variety of email addresses to send the harassing messages to Ms. Kelley, officials said.
As a reserve intelligence officer, Mrs Broadwell presumably had access to classified material from a variety of other sources.
When the FBI investigated, it traced the emails to Paula Broadwell, bringing to light her affair with Gen Petraeus.
I, for one, am worried about the well-being of Holly Petraeus, Scott Broadwell, and the Petraeus and Broadwell children.
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The opportunity for Broadwell to be found out had, potentially, been in the public domain for almost a year.
One story worth reading is by Washington Post writer Vernon Loeb, who co-authored the Petraeus biography with Broadwell.
FORBES: David Petraeus: Everything You Need To Know About The Scandal
Should General Petraeus have resigned after his affair with Paula Broadwell was discovered?
FORBES: Four Questions (and Answers) about the General Petraeus Scandal
The news business has no problem giving saturation coverage to such salacious stories as David Petraeus' dalliance with Paula Broadwell.
Broadwell, 40, wrote a biography of Petraeus, a retired general who led U.S. forces in Iraq and later in Afghanistan.
It has been reported that Petraeus communicated with Broadwell through a private Gmail account he set up with a pseudonym.
FORBES: David Petraeus: Everything You Need To Know About The Scandal
Petraeus resigned on November 9 as the FBI investigated whether his biographer, Paula Broadwell, had inappropriate access to classified information.
Petraeus resigned on November 9 amid an FBI investigation into whether his biographer, Paula Broadwell, had inappropriate access to classified information.
In this case, people are riveted by the extramarital affair between America's once-golden General, David Petraeus, and his biographer, Paula Broadwell.
After agents interviewed Ms. Broadwell, she let them examine her computer, where they found copies of classified documents, according to the officials.
Unlike the notorious Ms. Kardashian or Ms. Lohan, Ms. Broadwell enters the agency relationship with much stronger prospects for a reputation rescue.
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To hide their affair, Petraeus and Broadwell reportedly shared a Gmail account.
FORBES: Petraeus Scandal Shows How Transparent Online Communications Can Be
This led it to uncover evidence of the affair and the "trick" Gen Petraeus and Ms Broadwell used to conceal their affair.
When the FBI investigated, it traced the emails to Petraeus biographer Paula Broadwell, bringing to light her affair with the CIA chief.
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