Cop Killer

A Cop Killer is, as the title suggests, a person who kills at least one man working in the local police force. Usually, when a cop is murdered, the rest of the police force makes hunting the perpetrator down a top priority, as they intend for their colleague's death to not be in vain.

Criminal Minds
''Usually, whenever a policeman is killed on the show, it is usually incidental and not intentional. One example of the contrary is Animal. Some cop killers on the show include:''


 * Cally's Tribe ("The Tribe") - While approaching the house of their soon-to-be victims, the Minton family, the tribe was forced to kill a policeman who was assigned to spy on the family.


 * Animal ("Brothers in Arms") - Animal dedicated most of his killings to murdering those he saw as figures of authority: police officers. He successfully managed to kill four.


 * George Foyet ("Omnivore", "...And Back﻿", "Nameless, Faceless", and "100") - When Morgan and a Boston policeman raided one of his homes to look for him, Foyet ambushed the latter outside and killed him by apparently stabbing him to death.


 * Dale Shrader ("Retaliation") - When his partner Joe sent the police cruiser containing him, Prentiss, and a police detective crashing down a hillside as part of an escape plan, Dale recovered from the crash quickly and strangled the detective to death before stealing the keys to his handcuffs.


 * Connor O'Brien ("Public Enemy") - After killing a flower salesman at a marketplace, Connor stayed behind at the crime scene, apparently to feed off of the crowd's fear, when he was spotted by a policeman he knew while attempting to flee, forcing him to stab him repeatedly in the neck and collar when he tried to detain him.


 * Ronald Boyd ("A Rite of Passage") - Devolving into a spree killer, Boyd lured his boss into a secluded area before shooting her to death. Then, while attacking the Lugo Cartel with a shotgun, he murdered the deputy accompanying him with a revolver when he witnessed the massacre.


 * Billy Flynn ("Our Darkest Hour" and "The Longest Night") - After luring Morgan and Detective Matt Spicer into a trap using Spicer's sister and daughter, Billy knocked Morgan out briefly before goading Spicer into surrendering by threatening to shoot Ellie. When Spicer caved in to the demands, much to Morgan's distress, Billy shot him in the chest at point-blank range.

Real World

 * 2009 Oakland shootings
 * 2009 Pittsburgh police shootings
 * Lakewood police officer shooting