ben crump feels optimistic about the case. >> the video is the most important witness in this entire case. >> reporter: a case underway, a story now returning to the national spotlight as the final chapter begins catie beck, nbc news. brunswick, georgia now to our nbc news exclusive one of the nation's most outspoken advocates for police reform is out of a job. miami's police chief joining a long line of top cops who recently left their posts tonight, he speaks out to gabe gutierrez. >> reporter: miami's mayor once called him the michael jordan of police chiefs. but tonight art acevedo is out of a job. after city commissioners fired him just six months into his tenure. >> pretty embarrassing episode of a 35-year career. >> reporter: he claims he was fighting corruption and punished for sending a moment me accusing city commissioners for interfering with investigations but his critics say acevedo lost the trust of the rank and file,