Former Dallas Police Chief David Brown, left, speaks to reporters after Mayor Lori Lightfoot, right, nominated him to be Chicago's next police superintendent Thursday, April 2, 2020. The third was Ernest Cato, a deputy chief on the Chicago police force. The mayor said one of the things that most impressed her about Brown was that he implemented many reforms in Dallas that the Chicago department is now trying to introduce. During his tenure in Dallas, Brown took steps that were controversial among officers, including making use-of-force data public. In December, just days after Johnson announced his retirement and Lightfoot named Beck as the interim superintendent, the mayor abruptly fired Johnson.