Prosecutors dropped all remaining charges against three Baltimore police officers accused in the arrest and death of Freddie Gray in a downtown courtroom on Wednesday morning, concluding one of the most high-profile criminal cases in Baltimore history.

The move was an apparent acknowledgement of the unlikelihood of a conviction following the acquittals of three other officers on similar and more serious charges by Circuit Judge Barry G. Williams, who was expected to preside over the remaining trials as well.

It also means the office of Baltimore State's Attorney Marilyn J. Mosby will secure no convictions in the case after more than a year of dogged fighting, against increasingly heavy odds, to hold someone criminally accountable in Gray's death.

Officer William Porter's trial ended with a hung jury and a mistrial in December, before Williams acquitted Officers Edward Nero and Caesar Goodson and Lt. Brian Rice at bench trials in May, June, and July, respectively.

In a hearing Wednesday meant to start the trial of Officer Garrett Miller, Chief Deputy State's Attorney Michael Schatzow told Williams that the state was dropping all charges against Miller, Porter and Sgt. Alicia White, the Baltimore Sun reports.