The latest in the Freddie Gray case, after an officer was ordered to testify against a fellow officer (all times local):

10:30 a.m.

An attorney for a Baltimore police officer charged in the death of Freddie Gray is asking an appeals court to block a judge's ruling that the officer must testify at his colleague's upcoming trial.

Baltimore Circuit Judge Barry Williams ruled Wednesday that William Porter, whose trial ended in a mistrial last month, must testify if called as a prosecution witness at the trial of Caesar Goodson. Goodson is the van driver who faces the most serious charge of all six officers indicted in connection with Gray's death. Goodson's trial begins Monday; Porter is set to be tried again in June.

Porter's attorneys filed court papers Thursday asking the Maryland Court of Special Appeals in Annapolis to block that ruling so that Porter can't be forced to testify.