BALTIMORE — A Maryland appeals court has postponed the trial of a police van driver charged with second-degree murder in death of Freddie Gray.

Jury selection was delayed Monday so that the Maryland Court of Special Appeals can address whether another Baltimore officer can be compelled to testify against Caesar Goodson.

Baltimore Circuit Judge Barry Williams said prosecutors asked for a delay in the trial and Goodson’s lawyers objected. However, he said that request was moot because the appeals court — the second-highest in the state — had already ordered a delay.

Williams ruled last week that William Porter, whose trial ended in mistrial last month, must testify against Goodson despite Porter’s claim that he has a right not to incriminate himself. The court of special appeals last week temporarily blocked the ruling while its judges consider whether to uphold that decision.

Gray died in April from a broken neck he suffered during a van ride.

Goodson was with Freddie Gray for every second of his 45-minute trip from the site of his arrest to the Western District police station, where Gray arrived critically injured and unresponsive. But Goodson’s account of what happened on that day remains a mystery: He is the only one of six officers charged in Gray’s death not to speak to investigators.