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Gun-death tally: Every American gun death since Newtown Sandy Hook shooting (INTERACTIVE) The answer to the simple question in that headline is surprisingly hard to come by. So Slate is collecting data for our crowdsourced interactive. This data is necessarily incomplete (click here to see why, and to learn more about @GunDeaths, the Twitter user who helped us create this interactive). But the more people who are paying attention, the better the data will be. You can help us draw a more complete picture of gun violence in America. Update, Dec. 31, 2013: After a year of gun deaths, Slate is retiring this project. Click a marker below to filter incidents by that location. © OpenStreetMap contributors Any Age Group Adult Teen Child Matched Deaths: 12,042 or more between Newtown and Dec. 31, 2013 Fetching latest data Show Methodology Each person under 13 years of age is designated "child"; from 13 to 17: "teen"; 18 and older: "adult." The same icons used to represent males is also used to represent individuals of unknown gender. —Dan Kois, senior editor, Slate