Anderson County police say Taylor Ann Kelly fired one shot at 26-year-old Blake Wardell, missing the armor's protective Kevlar and instead shooting through fabric, into the victim's heart.
Paramedics attempted to revive Wardell, but he was pronounced dead at the scene.
Wardell and Kelly and were with friends in a garage after midnight when the incident occurred. Police said there was no evidence of heavy drug or alcohol use at the time. Kelly has a documented fondness for firearms, as many of her Facebook photos show her posing with guns.