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King Louis XVI was overthrown and beheaded by the guillotine.
I think you are talking about King Louis the sixteenth. He was the king during the French revolution and was detained by the revolutionaries and later beheaded at the guillotine.
Marie-Antoinette, wife and Queen of Louis XVI, was executed by guillotine on the grounds that she had committed treason by corresponding with her relative who ruled Austria, a country at war with France. She was also accused of a number of other crimes, from wasting the national treasure (which was partly true) to quite ridiculous items like incest with her son.
You would likely be killed BY a guillotine if placed IN a guillotine.
The Guillotine