The king was now a prisoner in his own palace.
The National Assembly decided that Louis XVI could no longer be a king. France would become a republic and Louis a normal citizen. They would call him "citizen Capet" instead of "his majesty".
In the meantime, several European countries worked together (= a coalition) to attack France and put the king back in power.
Some radical members of the National Assembly just wanted the former king dead.
They got what they wanted. Louis was sentenced to death for betraying his country.
Watch the video of Louis' execution.