When the case went to trial , former President Nixon testified on Felt 's behalf . W. Mark Felt , known as ` ` Deep " , '' has died , they tell CNN . Felt provided information to Washington Post reporters about the Watergate break - in . Watergate scandal eventually led to President Richard Nixon 's resignation . Felt : ` ` I thought I was doing the right thing ''
W. Mark Felt , known as ` ` Deep " , '' has died , they tell CNN . Felt provided information to Washington Post reporters about the Watergate break - in . Watergate scandal eventually led to President Richard Nixon 's resignation . Felt : ` ` I thought I was doing the right thing ''