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In Miami, Florida, a sniper opened fire from the rooftop of a manufacturing plant, killing one employee and injuring two others in the parking lot below. Police discovered spent shell casings on the roof, and the gun was found in the yard of a nearby home. The shooter had scratched the serial number off of the gun, hoping to make it untraceable. But forensic scientists had a way to make the number reappear. Originally aired as Season 7, Episode 33.