Chicago Mayor Rahm Emanuel asked for calm after city officials released the horrific dash cam video of a white officer shooting and killing a 17 year old black teen.

Tuesday evening (November 24) many took to the streets to protest the death of Laquan McDonald, who was shot 16 times by 37 year old Jason Van Dyke in October 2014.

Chicago Police Superintendent Garry McCarthy said in a press conference he understands how people will feel after watching this video.

"The officer in this case took a young man's life, and he's going to have to account for his actions," McCarthy said.  "People have a right to be angry, people have a right to protest."

McCarthy continued by saying he is anticipating anger and frustration but not violence.

"We are not predicting doom and gloom," he later added  said "We are predicting protests."

Officer Van Dyke has been charged with first-degree murder and is being held without bail. Cook County State’s Attorney Anita Alvarez said she came to her conclusion weeks ago, but held off until the federal authorities completed their portion of the investigation.

"No one understands the anger more than us but if you choose to speak out, we urge you to be peaceful,” Alvarez said in a statement. “Don’t resort to violence in Laquan’s name, let his legacy be better than that.”