The investigation into Vince Gray‘s 2010 mayoral campaign is still open, but now the top two prosecutors behind it are gone. Following former U.S. Attorney Ron Machen‘s resignation in March, Machen protege and acting U.S. Attorney Vincent Cohen Jr. resigned this afternoon after losing his bid to become the permanent U.S. attorney.

Instead of Cohen, the new U.S. attorney, pending confirmation by the Senate, will be Channing D. Phillips. Phillips left the U.S. Attorney’s Office in 2010 after losing his own bid to fill the top spot permanently.

Cohen’s exit could make it easier for the U.S. Attorney’s Office to walk away from the endless Gray investigation, since Phillips doesn’t bet his reputation on it in the same way that Cohen and Machen did. While Cohen’s goodbye press release notes his successes with Wilson Building corruption—-including criminal charges against three councilmembers, one D.C. Council staffer, and eight people associated with the Gray campaign—-Attorney General Loretta Lynch didn’t mention his public corruption work in her own statement.

“There are some important cases that I wish I could see through to their conclusions,” Cohen said in his press release, tantalizingly.

Photo by Darrow Montgomery