This story is sad in that someone was killed by a handgun. It is also sad that someday, somewhere, an anti-gun nut will use it as "another teen-ager killed by a handgun."
The facts seem to be that these two fine young fellows decided to threaten deadly violence to steal money from a small business owner. This business owner happens to be a law-abiding, responsible gun owner who has spent some time on the firing line.
You can pick up the story here: http://www.wsbtv.com/video/26040997/index.html