A Cop Killer is, as the title suggests, a person who kills at least one person 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 go unpunished.
- Kevin Cornwell ("The Girl in the Blue Mask") - Kevin's second victim was a policeman, whom he beat into submission and removed his face via an air-pressure gun and tearing.
- 2009 Oakland shootings
- 2009 Pittsburgh police shootings
- Lakewood police officer shooting