Nashville police have said the woman, Sahel Kazemi, used the weapon to kill McNair and then herself on July 4.
Police said the 19-year-old Kazemi met Gilliam while she was trying to sell her car and told him she was looking to buy a gun. Gilliam was arrested about two weeks after the shootings.
Gilliam, who is 33, faces up to 10 years in prison and a $250,000 fine. According to prosecutors, he was convicted in 1993 in Florida for murder and attempted armed robbery.
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