ongoing special report contains photo galleries, videos, links to Tribune crime apps and overnight accounts of crimes. Because of the nature of violence, you will encounter graphic images and explicit language. But please watch. Our city’s future is at risk.

Matthew Gant spent almost 20 years in prison, after being convicted in the murder of a man that Gant said killed his brother. Now Gant works on the street in Chicago's North Lawndale neighborhood, mediating conflicts.

This video is just a small part of the Tribune's immense project of documenting gun violence, titled "Chicago Under The Gun," and you can check out the photos, videos, and coverage here.