BALTIMORE (AP) -- An attorney for Freddie Gray's family is calling for calm after a mistrial was declared in the case of an officer charged in Gray's death.

Billy Murphy, who represents Gray's mother and stepfather, says he has every confidence Officer William Porter will be convicted if he is tried a second time. Porter is charged with manslaughter, assault and two other counts in Gray's death.

MORE: Mistrial declared in trial of first officer in Freddie Gray case  

Murphy said Wednesday that hung juries are "part of how the system works." He says Gray's family is not angry and that they want people to remain calm, understand what happened and keep their emotions in check.

The jury deliberated for a total of about 15 hours but couldn't reach a decision. It's not yet clear if Porter will face another trial.

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