David Petraeus, director of the CIA and decorated four-star general, resigned Friday over an extramarital affair, NBC News reported.
Petraeus told President Obama about the affair and offered his resignation during a Thursday meeting. Obama accepted the resignation Friday.
Petraeus disclosed the affair to the CIA work force in a letter Friday afternoon.
The affair, with Petraeus biographer Paula Broadwell, was discovered by the FBI. Broadwell is under investigation for improperly trying to access Petraeus's email and potentially gaining access to classified information.
Officials in the White House were unaware of the affair until this week, the New York Times reported.
"Dave's decision to step down represents the loss of one of our nation's most respected public servants." James R. Clapper, the director of national intelligence, said in a statement.