Raymond Smith of Charleston, S.C., kneels in prayer in front of the Emanuel AME Church in Charleston before a worship service on June 21. Stephen B. Morton/AP hide caption

itoggle caption Stephen B. Morton/AP

Public memorials, like the one at the scene where Freddie Gray was arrested, have become sites to commemorate other deaths of unarmed black men in similar police encounters across the country. David Goldman/AP hide caption

itoggle caption David Goldman/AP