A convicted felon accused of selling the gun used to kill ex-NFL quarterback Steve McNair has been indicted on a firearm charge.

A federal grand jury in Nashville, Tenn., on Wednesday charged Adrian J. Gilliam Jr. with one count of being a felon in possession of a firearm.

Gilliam, of La Vergne, is accused of selling a loaded 9 mm pistol to McNair's mistress, Sahel Kazemi, for $100 two days before McNair was shot.

Police said the 20-year-old waitress shot McNair at his downtown condo July 4 before turning the gun on herself.

Gilliam remains in federal custody and faces 10 years in prison if convicted.

McNair, a married father of four, retired from the NFL last year after playing for the Tennessee Titans and the Baltimore Ravens.