White House aide who exposed Nixon dead at 99

Alexander Butterfield, the White House aide who disclosed Richard Nixon’s secret audio taping system, providing the “smoking gun” of the Watergate scandal that brought down the president, has died at age 99.

The death of Butterfield, whose revelation about the listening devices and recording system set off a roaring legal battle over the president’s right of executive privilege, was confirmed by his wife Kim to The Washington Post and the New York Times.

Both newspapers said...