According to the International Hunter Education Association, approximately 1,000 people in the US and Canada are accidentally shot by hunters every year, and just under a hundred of those accidents are fatalities. Most victims are hunters, but non-hunters are also sometimes killed or injured. Although some other forms of recreation cause more fatalities, hunting is one of the few activities that endangers the entire community, and not just the willing participants.
The Committee to Abolish Sport Hunting maintains the Hunting Accidents Center site, which collects news stories about hunting accidents throughout the United States. Although the list is long, it's not comprehensive, and not every hunting accident is reported in the news. If you've seen a newspaper article about a hunting accident that is not included in the site, you can submit a report.