Maryland's highest court has agreed to take up a key issue in the trials for the Baltimore officers charged in the death of Freddie Gray, postponing trial proceedings until it can make a ruling.

The state's Court of Appeals ruled Thursday that it would take up the issue of whether one of the officers, William Porter, whose October trial ended in a mistrial, could be forced to testify against the other officers even though he is awaiting retrial. The issue had previously been pending in the Court of Special Appeals.

The order stalls the trial for Officer Edward Nero, whose trial was scheduled to begin with jury selection Monday.

Nero's attorney, Marc Zayon, could not comment because of a gag order in the case.

The court will hear oral arguments March 3.