Former green beret and doctor who was convicted in the murder of his pregnant wife and two daughters, though he denied involvement.
In February of 1970 he called the police to report a stabbing, and his family was found brutally stabbed and clubbed; MacDonald himself was alive but similarly wounded.
His conviction was appealed in higher courts, but was upheld by the U.S. Supreme Court; his supporters never quit advocating on his behalf.
He reportedly had numerous extramarital affairs, which contributed to his conviction.
Gary Cole played him in the TV mini-series Fatal Vision, based on his story.