The suspect was barred from being able to legally purchase or possess firearms. Federal authorities have arrested a Virginia man accused of unlawfully selling a firearm to the former National Guardsman who authorities said killed an instructor and injured two students in an ROTC class at Old Dominion University on Thursday, according to newly unsealed court records. Kenya Chapman was charged with false statements and unlawful firearms dealing offenses in a criminal complaint on Friday for his alleged sale of a Glock 44 .22 caliber gun to Mohamed Jalloh, who was previously convicted in 2016 of attempting to provide material support to ISIS -- a federal felony that sent him to prison and barred him from being able to legally purchase or possess firearms. Jalloh opened fire Thursday on a class of ROTC members at ODU on Thursday morning, authorities said.…