On September 14, 2006, a gunman walked into Dawson College in Montreal and opened fire. One student was killed and 19 others were injured. The gunman killed himself. In this News in Review story we'll retrace the events of that tragic day. We'll look at who the gunman was and what might have led him to commit such a senseless and violent act. We'll also examine Canada's gun laws and whether anything could have been done to prevent the tragedy.