Night 0
Although Coruscant never lies silent at night, the council chambers did as its inhabitants had gone to sleep after lengthy days of discussion. It was not until the early morning that the absence of a certain council member, the Jedi ambassador, was noted and the alarm was only raised when he missed the lunch meeting. A search of his room yielded the Jedi saber on the ground. As the dreadful truth spread amongst the crowd another realisation came through with it; the Jedi ambassador had been murdered, and the killers were clearly trained killers. Who else could have the time to kill someone in a single night?
Later, during the afternoon-tea meeting, someone raised the question whether or not guards should be summoned. The council was determined on this point however, any outside involvement would also inevitably leak the events to the public. They simply couldn't have the people thinking there were assassins and traitors amongst their new leaders. This would have to be settled internally.
And so, all doors to the council are closed for the time being. Official reason given to the public is the Council are in discussion about the Rebel Alliance government setup.
In actual fact, the council members are discussing who among them could have done it.
A slain new Jedi Ambassador is not a good start to the new council leaders.
Let the voting begin. May the Force be with you!