Former NYPD commissioner Ray Kelly has been signed by a major TV producer to consult on a drama "loosely" based on his years as head of the world's largest city police force, according to a report in Variety. 

  The trade says Mark Gordon, a major TV force in his own right ("Quantico," most recently) will produce, along with Jeffrey Nachmanoff, a veteran movie and TV producer (most recently "Chicago Fire.") Translation: This series will almost certainly see light of day, or light of primetime...

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  Kelly -- under the editorial auspices of former Newsday columnist Ellis Henican -- recently published his memoir, which was well-received, and will presumably provide a certain amount of narrative flavor to the new TV enterprise.

  But how much of this will be about Kelly -- 50 years in blue, and the longest-serving commissioner -- and how much a fictional concoction is unclear from the Variety report which describes a show  that "follows two Joint Terrorism Task Force Agents, a FBI Special Agent and a NYPD detective, both very different people with secrets..."

  In any event, this is believed to be Kelly's first foray into in Hollywood, which has long gone to the NYPD well for inspiration (and stories) --  Bill Clark, for example, as a source of wisdom and stories for David Milch's and Steven Bochco's "NYPD Blue." And "Blue Bloods," of course, which remains a successful on-going series.

 And speaking of more blue: "Shades of Blue," starring Jennifer Lopez and Ray Liotta, as detectives in a Brooklyn precinct, arrives Jan. 14. 

  The field is getting crowded.