Billy formerly held Demarest’s job heading the JTTF, then moved
        on to head the Newark office before being assigned to the prestigious
        Washington job.
      He’s said to be leaving in March, when he turns 50 and is eligible
        for his annuity.
       Mershon, meanwhile, has been trying to leave the bureau for a Wall
        Street job since arriving in New York in late 2005. Bureau sources say
        he applied for — but did not get — a job at the N.Y. Stock
        Exchange. Ditto at Bear Stearns. It’s not known if he had applied
        for Demarest’s job at Goldman-Sachs. 
       In June, he turns the Bureau’s mandatory retirement age of 57.
        Sources say that Director Mueller is planning to give him a six-months
        extension, which theoretically he can keep getting for the next three
        years, until he turns 60. 
       Such extensions are rare, say Bureau sources. The rationale behind
        them is that the agent is involved in a critical investigation or prosecution,
        whose retirement would jeopardize the bureau’s efforts. 
       So far as we can tell, Mershon falls into neither of these categories. 
       Rather, he is perhaps best known for announcing, in this very column,
        that his first priority upon taking over in New York was to accommodate
        Police Commissioner Ray Kelly, an FBI critic and rival. The result, as
        one might expect, has been low agent morale. 
       So here’s the kicker. Unable to bail out himself, did the prospect
        of his remaining push Demarest and Billy to jump ship earlier than they
        he might have? 
       Put another way, has Mershon's inability to find a job outside the
        FBI hurt the FBI's ability to retain future leaders in New York? 
       Mueller’s rational for granting Mershon an extension is said
        to be to maintain “continuity.” As Demarest’s and Billy’s
        departures indicate, granting him the extension seems to have had the
        opposite effect. 
       The only continuity would seem to be New York office’s subservience
        to Kelly — and the continued poor morale among the Bureau’s
        New York agents.
       New York Bureau spokesman Jim Margolin confirmed that Demarest resigned
        last Friday. He declined to comment on Joe Billy other than to say he
        is still employed in Washington with the FBI. Margolin added that Mershon
        did not wish to discuss his long-range plans. 
       The Bureau’s chief spokesman in Washington, Asst. Director John
        Miller, did not return an e-mail.