Proceedings are scheduled to begin this week for the fourth Baltimore police officer slated to stand trial on charges stemming from the death of a 25-year-old prisoner whose neck was broken in the back of a police transport wagon.

Pre-trial motions begin Tuesday in the trial of Lt. Brian Rice on charges of manslaughter, assault, reckless endangerment and misconduct in office in the death of Freddie Gray.

Rice is the highest-ranking officer charged in the case. Two other police officers charged in the case were acquitted, and the proceeding against a third officer was declared a mistrial.

Gray died April 19, a week after he suffered a critical spinal injury in a police wagon while he was handcuffed and shackled but left unrestrained by a seat belt.