Update, 5/3/12, 3:35 p.m. EDT: The second paragraph of this story has been revised to include a statement from a Dewey & LeBoeuf spokesman.

The frantic efforts of Dewey & LeBoeuf’s leaders to save the struggling firm appear to have reached a dead end, with sources inside and outside the firm familiar with its operations telling the The Am Law Daily Thursday that Dewey is poised to close by May 15 and possibly sooner.