Chicago is on edge tonight as a police dashcam video is being released of the shooting of Laquan McDonald. McDonald, a 17 year old black teen, was fatally shot by Chicago Police officer Jason Van Dyke on October 20, 2014. McDonald was reportedly behaving erratically and wielding a knife when Officer Van Dyke arrived on the scene. Prosecutors say Van Dyke shot McDonald a total of 16 times. The officer has been charged with murder and is being held without bail awaiting trial. Chicago officials are expecting riots upon the release of the video this evening.