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1. THE AFFAIR
Last week, retired General David Petraeus resigned as head of the CIA, citing infidelity. What's the story behind the married military man's betrayal? In about November 2011, Petraeus – the former top U.S. commander in Afghanistan – began an affair with a married writer, Paula Broadwell. (That was a couple of months after he retired from the military and became head of the CIA.) The pair first met back in 2006 and would spend a lot of time together traveling the world while Broadwell worked on Petraeus's biography, All In: The Education of General David Petraeus.
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2. THREATENING EMAILS
About six months after the affair began, "menacing" and "threatening" anonymous emails from several addresses started popping up in the inbox of a Florida socialite named Jill Kelley, an events organizer for military personnel at a base in Tampa. Well-connected with top military brass, Kelley was a close friend of Petraeus and his family. The emails were cryptic, but at least one of them accused Kelley of inappropriately touching "him" under a table; another asked if Kelley's husband was aware of her actions.
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3. THE SHIRTLESS FBI AGENT
An alarmed Kelley disclosed the emails to a male FBI agent who was also a friend. Earlier, the agent allegedly sent a shirtless picture of himself to Kelley. "Agent Shirtless," later identified as Frederick Humphries, whose lawyer characterized the picture as a "joke photo" and not sexting, alerted the FBI's cyber crimes unit about the emails, and an investigation began, whicheventually uncovered not only the Broadwell/Petraeus affair but that the anonymous emails had come from Broadwell. She was apparently leery of Kelley's intensions toward Petraeus, though there is no evidence Petraeus and Kelley had an affair.
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4. PETRAEUS'S STUNNING DOWNFALL
Two days after his Nov. 6 reelection, President Barack Obama was informed of the investigation's findings. In one of several issues sparking conspiracy theories, the FBI had those findings before the election, but only made them known to the White House – and the voters – afterwards. On Nov. 9, the president accepted Petraeus's resignation from the CIA.
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5. STRANGE COMPLICATIONS
Just days after Petraeus stepped down, the Pentagon announced that his replacement in Afghanistan, Gen. John Allen, was also under investigation. The married Allen allegedly exchanged up to 30,000 emails with none other than Kelley, including some described by a senior defense official as "flirtatious" and "potentially inappropriate," according to the Associated Press. The FBI is also looking into "Agent Shirtless," who despite being barred from the Petraeus investigation, allegedly continued to press the matter, including alerting a Republican congressman about it.