Nbc nightly news begins right now. Announcer from nbc news World Headquarters in new york, this is nbc nightly news with lester holt. Good evening. Chicagos top come is out. There is new pressure on the mayor who fired him to follow him out the door. The political and emotional upheaval growing tonight from the videotape killing of a teenage suspect allegedly murder ed by a Chicago Policeman. More than the tape itself of a 17yearold be ing shot 16 times it is the battle to keep the video under wraps and the more than yearlong delay in filing charges that has mayor ram emmanuel in full damage control mode. Stephanie gosk has the developments. Reporter Chicago Police superintendent Gary Mccarthy is with us. Reporter earlier this morning Gary Mccarthy defended his job. Who said im not accountable . I have been held accountable. Reporter within hours he was fired. He has become an issue rather than dealing with the issue and a distraction. Reporter mayor rahm emanuel said the public trust