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Greg Zanis staples a photograph to a wooden cross at a planned prayer vigil and rally against violence in Chicago, Illinois on May 20, 2017. Zanis makes a personalised cross, every year, for each person murdered in Chicago, which is already over 220 so far. The largest city in the Midwest has been struggling with a stubbornly high murder rate that peaked at more than 750 last year, the highest in two decades. / AFP PHOTO / JIM YOUNG (Photo credit should read JIM YOUNG/AFP/Getty Images)

Greg Zanis staples a photograph to a wooden cross at a planned prayer vigil and rally against violence in Chicago, Illinois on May 20, 2017. 
Zanis makes a personalised cross, every year, for each person murdered in Chicago, which is already over 220 so far. The largest city in the Midwest has been struggling with a stubbornly high murder rate that peaked at more than 750 last year, the highest in two decades. / AFP PHOTO / JIM YOUNG        (Photo credit should read JIM YOUNG/AFP/Getty Images)