The team investigates a case involving a police officer, Kevin Hopkins, who shot and killed a man named Timothy Brown while pursuing him for the burglary of a jewelry shop. Hopkins asserts that his actions were in self-defense as he claims Brown had pulled a gun and shot at him. Hopkins' partner admits he did not hear an initial gunshot from Brown and Brown's hands also test negative for gunshot residue. Pressured by protests and riots from the public in response to the shooting, the CSI's search for additional evidence and eventually find a bullet casing at the crime scene. A ballistics match to several open cases links the location of one shooting to the address on a summons sheet found in the pocket of the jacket left behind by the other burglar. The team heads to the location and winds up in separate chases in which one of the burglars is shot down by Jo when he reaches for his gun and the other, a man named Ray Griffin, is taken into custody. Griffin admits to the robbery and to shooting at Hopkins before escaping, while Adam discovers that the jewelry Brown had on him was his own and not stolen from the store. Brown had just pawned some of his jewelry to buy an engagement ring for his girlfriend. Hopkins mistook Brown for Griffin since they were wearing the same clothes and shot Brown as he was reaching for his cell phone. Brown was in the wrong place at the wrong time. Inspired by Brown's mantra to make the most of every day, Mac proposes to Christine and she accepts.