There are currently four corruption investigations into the mayor. She managed three of them.

Mayor Eric Adams’s counsel and chief legal adviser, Lisa Zornberg, abruptly resigned — a major departure from the administration announced late Saturday night as the mayor and his inner circle face an onslaught of federal investigations.

Ms. Zornberg, a former senior Manhattan federal prosecutor in the office that is currently conducting three separate corruption investigations into the mayor and some of his senior aides, has been a fierce defender of Mr. Adams over the past 10 months. She encouraged New Yorkers not to rush to judgment after the first investigation — into the mayor’s campaign fund-raising — came to light.

“It has been a great honor to serve the city,” she wrote in a brief letter to the mayor on Saturday. “I am tendering my resignation, effective today, as I have concluded that I can no longer effectively serve in my position. I wish you nothing but the best.”

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The U.S. attorney’s office for the Eastern District of New York in Brooklyn is conducting the fourth.