The guy who allegedly sold the gun that killed Steve McNair -- a man named Adrian J. Gilliam Jr. -- has been arrested by ATF agents in Nashville, Tenn.
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UPDATE: Gilliam has been charged with illegally possessing a firearm. A big no-no for the convicted felon.

Gilliam was convicted of murder and attempted armed robbery in 1993.

http://www.tmz.com/2009/07/17/arrest-in-mcnair-murder-case/