Cook County State’s Attorney Eileen O’Neill Burke’s top aide stepped down Monday, less than a year into her tenure.

O’Neill Burke credited the resigning First Assistant State’s Attorney Anna Demacopoulos’ “tireless efforts on behalf of the people of Cook County” in an email to her staff.

“Anna Demacopoulos stepped away from a thriving private practice in order to utilize her legal expertise to help stabilize the Cook County State’s Attorney’s office and implement innovative and needed restructuring,” O’Neill Burke wrote of the former judge and prosecutor. “Now that those restructures are complete, Anna is resigning her position as First Assistant and returning to her private practice.”

In a statement late Monday, Demacopoulos said she was “proud of the progress we have made together in

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