FILE - In this Aug. 20, 2015, file photo, St. Louis Police Chief Sam Dotson, left, appeals for calm alongside Mayor Francis Slay in St. Louis following the death of a black 18-year-old who was fatally shot by police. Newly elected Mayor Lynda Krewson announced Wednesday, April 19, 2017 that Dotson, who presided over the police department through the often tumultuous period since the police shooting of Michael Brown in nearby Ferguson, Mo., is retiring. (AP Photo/Jeff Roberson, File)
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