As part of a settlement between Mills, the District Attorney's office, and the local U.S. Attorney, Mills agreed to "cooperate fully and truthfully with both the state and federal investigations, including civil rights investigations by the U.S. Justice Department," Mulroy's office said in a statement. Mills was one of five officers, all Black, to face four federal counts including excessive force and deliberate indifference - both civil rights offenses - and two witness-tampering counts stemming from the beating of Nichols, 29, on Jan. 7.