[The Killer] turned 21 in April, and a short time later he had a gun.
On Thursday, investigators did a trace of the handgun used in Wednesday’s shooting and determined that it was a .45-caliber handgun [the killer] purchased from a Charleston gun store in April, two law enforcement officials told CNN’s Perez and Bruer.
His grandfather says [the killer] was given “birthday money” and that the family didn’t know what he did with it.
Since the killer purchased the firearm from a gun store, we know that he was subject to –and passed– a background check. And guess what, it didn’t work.