The Coruscant Murders took place in 29 BBY, when a medium-sized group of assassins chose to kill a large number of Senators. Bodies started piling up and investigators didn't know what to do. Some were killed by the gang. The gang was called Fiery Heart. Many Senators left their positions because they were scared that they might die. They started putting more security, but the security died with the Senators. The most security was around the Supreme Chancellor, who never died. Eighty-three Senators, forty-two security people, and seven representatives died.
When the Republic started calling on the Jedi for help, the Order was devastated by how many beings had died. Two Jedi died, and Master Windu stepped in. He stopped all of them, and they were given life sentences.