Standoff (2006) - 1x06 - One Shot Stop

When a mysterious sniper kills a string of random people, CNU is determined to find the snipers hideout. But when they catch a suspect and announce their success, a police captain is shot and they learn that the man in custody is actually copycat. With the real sniper on the loose, negotiations arent enough and Matt and Emily must work with Frank and Duff to catch the killer before he hurts one of them.