BALTIMORE, MD - APRIL 30:  A mural of Trayvon Martin is seen on the side of a building in the Sandtown neighborhood where Freddie Gray was arrested on April 30, 2015 in Baltimore, Maryland. Gray, 25, was arrested for possessing a switch blade knife April 12 outside the Gilmor Houses housing project on Baltimore's west side. According to his attorney, Gray died a week later in the hospital from a severe spinal cord injury he received while in police custody.  (Photo by Andrew Burton/Getty Images)