David Petraeus today resigned as director of the CIA after admitting an extra-marital affair.
The former general had been one of the most respected figures in the military and intelligence establishment, but has stepped down to deal with the 'personal and professional issues' surrounding his relationship with a woman who is not his wife.
He had been sworn in as head of the CIA in September 2011 after serving as head of the coalition forces first in Iraq and then in Afghanistan.
Petraeus has publicly confessed to cheating on his wife Holly,
Deputy director Michael Morell will serve as acting head of the agency until a permanent replacement for Petraeus is appointed.
In his resignation letter to Barack Obama, Petraeus wrote that 'such behaviour is unacceptable' for a senior administration official.
He is believed to have feared that his infidelity would eventually become public, and therefore took the decision to quit before he was forced out.