Probably another example of racism.
Via CNN:
No criminal charges will be filed against the Chicago police officer who shot and killed Ronald Johnson in October 2014, Cook County State’s Attorney Anita Alvarez said Monday. Johnson was armed with a loaded gun at the time of the shooting, she said.
At a news conference, Assistant U.S. Attorney Lynn McCarthy played dashboard camera video of the shooting for reporters. The video appeared to show Johnson running away from police officers and into a public park. Out of view of the camera, the 25-year-old was shot twice, she said.