LOS ANGELES - Gerald R. Ford, who picked up the pieces of Richard Nixon's scandal-shattered White House as the 38th and only unelected president in America's history, has died, his wife, Betty, said Tuesday. He was 93. Ford had battled pneumonia in January 2006 and underwent two heart treatments — including an angioplasty — in August at the Mayo Clinic in Rochester, Minn. He was the longest living president, followed by Ronald Reagan, who also died at 93. Ford had been living at his desert home in Rancho Mirage, Calif., about 130 miles east of Los Angeles. Ford was an accidental president, Nixon's hand-picked successor, a man of much political experience who had never run on a national ticket. He was as open and straight-forward as Nixon was tightly-controlled and conspiratorial.