The jury in the trial of Baltimore Police Officer William G. Porter was one vote from acquitting him of involuntary manslaughter in the death of Freddie Gray, the most serious charge he faced, according to sources familiar with the deliberations.

Judge Barry G. Williams declared a mistrial because the jury deadlocked on all four charges last month. Jurors were two votes from convicting Porter of misconduct in office, and more divided on charges of assault and reckless endangerment, sources said.

How the jury voted was not publicly revealed, and the judge ruled that jurors' names should not be revealed, reports the Baltimore Sun.

Legal experts say the information is critical to understanding the process now playing out as prosecutors and Porter's defense attorneys prepare for his scheduled retrial in June. The information also could help shape legal strategies in the pending cases against the other five police officers charged in Gray's April arrest and death.