WASHINGTON — David H. Petraeus, the director of the Central Intelligence Agency and one of America’s most decorated four-star generals, resigned on Friday after an F.B.I. investigation uncovered evidence that he had been involved in an extramarital affair.
Mr. Petraeus issued a statement acknowledging the affair after President Obama accepted his resignation and it was announced by the C.I.A. The disclosure ended a triumphant re-election week for the president with an unfolding scandal.
Government officials said that the F.B.I. began an investigation into a “potential criminal matter” several months ago that was not focused on Mr. Petraeus. In the course of their inquiry into whether a computer used by Mr. Petraeus had been compromised, agents discovered evidence of the relationship as well as other security concerns. About two weeks ago, F.B.I. agents met with Mr. Petraeus to discuss the investigation.
Administration and Congressional officials identified the woman as Paula Broadwell, the co-author of a biography of Mr. Petraeus. Her book, “All In: The Education of General David Petraeus,” was published this year. Ms. Broadwell could not be reached for comment.
Ms. Broadwell, a graduate of the United States Military Academy at West Point, spent 15 years in the military, according to a biography that had appeared on her Web site. She spent extended periods of time with Mr. Petraeus in Afghanistan, interviewing him for her book, which grew out of a two-year research project for her doctoral dissertation and which she promoted on a high-profile tour that included an appearance on “The Daily Show With Jon Stewart.”
Married with two children, she has described Mr. Petraeus as her mentor.
Senior members of Congress were alerted to Mr. Petraeus’s impending resignation by intelligence officials about six hours before the C.I.A. announced it. One Congressional official who was briefed on the matter said that Mr. Petraeus had been encouraged “to get out in front of the issue” and resign, and that he agreed.
As for how the affair came to light, the Congressional official said that “it was portrayed to us that the F.B.I. was investigating something else and came upon him. My impression is that the F.B.I. stumbled across this.”
The Federal Bureau of Investigation did not inform the Senate and House Intelligence Committees about the inquiry until this week, according to Congressional officials, who noted that by law the panels — and especially their chairmen and ranking members — are supposed to be told about significant developments in the intelligence arena. The Senate committee plans to pursue the question of why it was not told, one official said.
The revelation of a secret inquiry into the head of the nation’s premier spy agency raised urgent questions about Mr. Petraeus’s 14-month tenure at the C.I.A. and the decision by Mr. Obama to elevate him to head the agency after leading the country’s war effort in Afghanistan. White House officials said they did not know about the affair until this week, when Mr. Petraeus informed them.
“After being married for over 37 years, I showed extremely poor judgment by engaging in an extramarital affair,” Mr. Petraeus said in his statement, expressing regret for his abrupt departure. “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.”
Mr. Petraeus’s admission and resignation represent a remarkable fall from grace for one of the most prominent figures in America’s modern military and intelligence community, a commander who helped lead the nation’s wartime activities in the decade after the Sept. 11 attacks and was credited with turning around the failing war effort in Iraq.
Mr. Petraeus almost single-handedly forced a profound evolution in the country’s military thinking and doctrine with his philosophy of counterinsurgency, focused more on protecting the civilian population than on killing enemies. More than most of his flag officer peers, he understood how to navigate Washington politics and news media, helping him rise through the ranks and obtain resources he needed, although fellow Army leaders often resented what they saw as a grasping careerism.
This article has been revised to reflect the following correction:
Correction: November 9, 2012
An earlier version of this article incorrectly stated that David H. Petraeus was expected to remain in President Obama’s cabinet. The C.I.A. director is not a cabinet member in the Obama administration.
