New York (CNN) — Before O.J. Simpson and Casey Anthony, before Scott Peterson, Amanda Knox and the cottage industry of cable news legal pundits, there was the shocking case of Jeffrey MacDonald. Ten years after his pregnant wife and two young daughters were butchered in their home in Fort Bragg, North Carolina, MacDonald was convicted of the killings and sentenced to life in prison. While a jury was convinced beyond a reasonable doubt of MacDonald’s guilt, many people were still left with one lingering question: Did he really do it? The drama surrounding the heinous crimes and the subsequent trial fascinated the public for decades. It sparked controversial best-selling books,…