BALTIMORE — Three officers poised to stand trial in the case of a 25-year-old black man who died after his neck was broken in police custody are asking for their cases to be dismissed.

Sergeant Alicia White and Officer Garrett Miller filed motions to dismiss their cases Monday, citing defects in the prosecution’s case. The Baltimore Sun reported Tuesday that Lieutenant Brian Rice had also filed a similar motion, but that motion was not publicly available. Rice is the highest-ranking officer charged in the case. He also is asking prosecutors to disclose grand jury minutes and testimony.

The officers are each facing identical charges of manslaughter, assault, reckless endangerment, and misconduct in office in the case of Freddie Gray, who died April 19, 2015, a week after suffering a critical spinal injury in the back of a police transport wagon. Gray’s death sparked protests and civil unrest that resulted in millions of dollars in property damage.

Two other officers charged in the case, including Caesar Goodson, the wagon driver who faced a second-degree murder charge, have been acquitted in the past month. The trial for a third officer, William Porter, ended in a mistrial in December. He is scheduled for retrial in September.

White and Miller’s attorneys argued in the motions that their clients’ cases should be dismissed because of recent disclosures, including an affidavit from a sheriff’s department major who wrote that he signed off on prosecutors’ charges without having any knowledge of their basis or details of their investigation.