(NEWSER) – Reginald Gildersleeve walked into a Chicago store Saturday night, wearing a mask, brandished a gun, pointed it at a worker and forced her to the back of the store, and announced his intention to rob the place, police say.

That's when another customer, who has a concealed-carry license, confronted Gildersleeve, took out his own gun, and fired several times, killing the 55-year-old robbery suspect, authorities say. It turns out Gildersleeve was only brandishing a fake gun at the time, but police say the investigation is almost finished and charges against the man who shot him are not likely, the Chicago Tribunereports. Gildersleeve's gun has been variously reported to have been a paint gun, a toy gun, and a paintball gun.

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