The long legal ordeal ended without a single conviction in 1807. Burr was legally a free man, but most Americans, including the president who said so publicly, still considered him a traitor, and a traitor who had escaped the gallows. After four years of self-imposed exile in Europe, Burr returned to New York, where he remained a social outcast, a man without a country. Jefferson may have lost his case, but he succeeded in destroying Burr or at least in helping Burr destroy himself.
Burr died in Staten Island on September 14, 1836. He is buried in Princeton New Jersey.
Information from the NEH magazine Humanities