On This Day, May 31: Mark Felt reveals ID as Watergate figure 'Deep Throat'

On May 31, 2005, Mark Felt admitted that, while No. 2 man in the FBI, he was "Deep Throat," the shadowy contact whose help to Washington Post reporters Bob Woodward and Carl Bernstein on the 1972 Watergate break-in led to U.S. President Richard Nixon's resignation.