Keechant Sewell, the first woman to lead the NYPD, announced her resignation as police commissioner on Monday. According to sources, City Hall was caught off surprise by Sewell’s sudden resignation.

“I have made the decision to step down from my position,” Sewell wrote in an email to the department Monday afternoon. “While my time here will come to a close, I will never step away from my advocacy and support for the NYPD, and I will always be a champion for the people of New York City.”

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Sewell, 51, was sworn in on January 1, 2022, following Mayor Eric Adams’ appointment. She left without giving a reason, and it was not immediately clear who would succeed her as chief of the largest police department in the nation.

“Since I joined you almost a year and a half ago we have faced tremendous tragedy, challenges and triumphs together,” Sewell wrote in the memo to the NYPD’s approximately 55,000 members.

According to The Post on Sunday, Sewell’s relationship with City Hall has appeared to deteriorate recently, with the commissioner feeling more and more constrained when attempting to make significant departmental decisions.

“She was fed up,” a NYPD source said Monday. “She was tired of being their puppet.”

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Law enforcement sources said that while Sewell had to get City Hall’s approval before making the changes, NYPD commissioners have historically had the power to promote rank-and-file officers to detective and detectives to higher ranks.

“They tied her up,” one source said. “There’s no executive choices on her behalf. If a cop distinguishes himself and she wants to promote him, she can’t do it.”

Sources said Adams was blindsided by her sudden resignation. Sewell was spotted at City Hall around 3:45 p.m. Monday but declined to answer questions. “The mayor was caught short,” a law enforcement source said Monday. “They did not think she would be leaving today. The earliest they thought it was later in the summer.”