An NYPD captain has been fired for sexting a detective with explicit language and pictures of his penis, according to NYPD documents.

Capt. Brian Flynn was canned by Commissioner Jessica Tisch in April — three months before his 20th anniversary on the job, meaning he lost the pension and health benefits to which he would have otherwise been entitled.

Flynn had pleaded guilty, hoping to save his job — or at least be allowed to retire so he could keep his pension and benefits.

He testified at a mitigation hearing at One Police Plaza that he took full responsibility for his actions, NYPD Trial Judge Jeff Adler noted in department documents, and admitted he had embarrassed his family and the NYPD.

A department psychologist, Dr. Gregory Mack , testified on Flynn’s behalf that the cap

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