Porter was the only one not to attend the hearing.  It appears Marilyn Mosby is leveraging Porter against the other five defendants; perhaps that explains Porter’s absence in court.

(Via Baltimore Sun) The six Baltimore police officers charged in Freddie Gray’s arrest and death will be tried separately over the course of the next several months, with proceedings against Officer William G. Porter starting Nov. 30.
The new timeline, which pushes the trials back from a previously scheduled date of Oct. 13, was established during a hearing in Circuit Court on Tuesday afternoon, where five of the six officers appeared before Judge Barry Williams for the first time. Porter waived his right to attend the hearing.
[…] The delay in Porter’s trial came at the request of the defense which said it needed time for further investigation. The delays in the five other officers’ trials came at the request of the state and was granted by Williams over the objections of the officers’ attorneys.
Prosecutors have previously said Porter is a “necessary and material witness” in their cases against Officer Caesar R. Goodson Jr. and Sgt. Alicia D. White, and therefore must be tried before them. If officers who made incriminating statements about their peers are not tried before them, they could refuse to take the stand in those trials to avoid self-incrimination in their own pending trials.
[…] The five officers’ appearance in court Tuesday added a new dimension to the hearing, the third in which the case has been discussed in open court.
Rice, Miller and Nero were dressed in dark suits; Goodson had on a black jacket and black rimmed glasses while White wore a black dress with red-rimmed glasses. The officers looked calm and didn’t show much emotion although they did exchange conversation and some smiles with each other and their attorneys.
Following Porter’s trial beginning Nov 30, Goodson’s trial will begin Jan. 6; White on Jan. 25; Miller on Feb. 9; Nero on Feb. 22; Rice on March 9.
Williams cited the state’s need to try the officers in a specific order as his reason for granting the postponements over defense’s objections.  (read more)