http://www.cnn.com/2015/11/24/us/laquan-mcdonald-chicago-shooting-video/ Chicago (CNN)Mayor Rahm Emanuel is asking the people of Chicago to come together and work for peace as protesters take to city streets. Police released dash-cam video Tuesday showing the shooting of 17-year-old Laquan McDonald, who was killed by an officer in October 2014. "I believe this is a moment that can build bridges of understanding rather than become a barrier of misunderstanding. I understand that the people will be upset and will want to protest when they see this video," Emanuel said. "We as a city must rise to this moment." Chicago has been preparing for protests in advance of the video's release, which was ordered by a judge to happen no later than Wednesday. McDonald was a black teenager. The officer who shot him, Jason Van Dyke, is white. He was charged Tuesday with first-degree murder in McDonald's death and is being held without bond. Chicago Police Superintendent Garry McCarthy acknowledged that residents "have a right to be angry."