Did you know one of our presidents was a murderer? Andrew Jackson killed rival horse breeder Charles Dickinson on this day in 1806 in a duel after accusing Rachael Jackson of being a bigamist. An accusation that wasn't entirely untrue as Rachael's first husband had failed to finalize their divorce papers. Jackson was said to of appeared in as many as 100 duels in his life. However I believe he was only involved in 13, still alot for a man who would live a long life full of hating his fellow man.