A former investigations manager for Chicago Public Schools is suing the Board of Education over her firing, alleging that her supervisors attempted to interfere in a string of “politically sensitive” cases.

Kelly Tarrant was the district’s investigations manager for seven years before her suspension in June. At the time, she was conducting several high-profile investigations, according to a civil complaint filed Tuesday in Cook County Circuit Court.

“Politically prominent persons outside of CPS had imposed pressure upon (Tarrant)’s direct supervisors to block (Tarrant) from exposing what she had already found in her investigations,” the complaint said.

One of those cases involved a Local School Council representative, who Tarrant learned was chief of staff to Ald. Gilbert Villegas, 36th

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