Fan Casting Cop Killer in Sort by Tropes

A staple of the Criminal Procedural when the writers want to create a "This Time, It's Personal" episode. A criminal kills a cop and the dead officer's colleagues have to avenge him via a Cop Killer Manhunt. These episodes frequently end with Police Brutality, as cop killing is very serious business. When the cops find the cop killer, they don't treat him very well. Not to mention that they're more likely to have "accidents" or be "driven to suicide" at some point between arrest, trial, and imprisonment. Or even just make no effort to capture the cop killer alive in the first place and declare that he was "shot while resisting arrest" regardless of whether it's actually true. Conversely, a cop killer will likely be regarded as particularly notorious by fellow criminals (which may very well be why the cop killer does it in the first place).