A Boston police officer who testified in Karen Read 's retrial has resigned, the department said Friday.

Officer Kelly Dever resigned, effective Sept. 1. Police didn't share more information on the circumstances around her resignation, saying only that the personnel order on the resignation was released Friday.

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She had been on leave, which a Boston police spokesman confirmed to NBC10 Boston in July.

Dever was a Canton police officer in January 2022 when Boston Police Officer John O'Keefe was found fatally injured in the snow on Fairview Road. Read was soon charged with second-degree murder in his death.

Dever was called to testify as the defense's third witness in June , and the back-and-forth with defense att

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