Died on the Fourth of July... Almost

Three presidents died on the 4th of July.
One broke the curse.
It's well known that John Adams and Thomas Jefferson famously died on the same day July 4th, 1826. Their simultaneous passing on the 50th anniversary of the signing of the Declaration of Independence is viewed as a wonderfully patriotic cosmic coincidence, or at least a victory of the human will to hang on. (Or possibly some good old-fashioned euthanasia.)