An NYPD detective whose family lineage with The Finest spans four generations hung up his badge and gun for the last time Friday – as he recalled a job he’s loved since “day one.”

Walter Harkins retired following a 33-year career with the department – part of around 150 total years of service his family gave the Big Apple — as colleagues and loved ones honored the dedicated officer with a walkout ceremony at the Ted Weiss Federal Building in lower Manhattan.

“I felt it [becoming a police officer] was in my blood,’ said the 62-year-old Queens resident who was on the FBI-NYPD Child Exploitation and Human Trafficking Task Force.

He started on the job in 1993, but his family history in law enforcement dates back the same year Grover Cleveland was elected president.

Harkins’ great-grandfath

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