shooting inside a maryland ch shopping mall. investigators have identified him as 19-year-old darion marcus aguilar. police say he shot and killed two people. five other people were hurt and the gunman killed himself. and now everyone is asking why. aaron, what more have we learned leading up to this event. >> reporter: county police say he purchased his shotgun legally a month ago and transported himself and the shotgun here yesterday morning by tax i. >> police still aren't talking