BALTIMORE (AP) — A judge will hold a scheduling hearing Tuesday in the case of six Baltimore police officers charged in Freddie Gray's death.

Prosecutors have asked Circuit Judge Barry Williams to try William Porter first because they want to call him as a witness against Caesar Goodson and Alicia White. Porter, Goodson and White face charges of manslaughter, misconduct in office, assault and reckless endangerment. Goodson also is charged with "depraved-heart" murder. Three other officers also face charges stemming from Gray's death.

The first trial is scheduled Oct. 13. However, defense attorneys indicated in a filing that some defendants might seek postponements because of "discovery issues" regarding evidence and witnesses. Williams said in a memo they would get a chance to argue for postponements.

Gray's death April 19 triggered rioting in Baltimore.