The announcement on Monday of charges against Major Evans and two others — Lt. Kashka Meadors and James Ramsey-Guy, a correctional officer — came more than nine months after that inquest, a relatively rare court proceeding in which jurors review evidence relating to a death and decide whether to recommend charges. The four other jail employees who were faulted by jurors at the inquest are not expected to face charges, Mr. Chisholm said, but the investigation was continuing.

Mr. Thomas was arrested in April 2016 and accused of shooting a man and later firing a gun inside a hotel and casino, according to local news reports. A federal lawsuit filed by Mr. Thomas’s estate said he had bipolar disorder and had been prescribed medication by a psychiatrist.

Once he was at the jail in downtown Milwaukee, prosecutors said, Mr. Thomas flooded his cell by stuffing his mattress cover into the toilet. The charging documents said that when Mr. Thomas was moved to another cell,…

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