Nate Ramo

Nate Ramo was a SWAT officer within the Gotham City Police Department, as well as a murder victim.

Batman: Arkham Origins
Nate Ramo, alongside most of his SWAT unit, was undergoing investigation of corruption by internal affairs. He decided to reveal everything he knew about his teammates corruption secretly. Unfortunately, one of his teammates, John DeMarco, learned of Ramo's attempted plea bargain, and proceeded to murder him via a hit and run just outside the police station. Batman, learning of the hit and run from a police dispatch via Officer Meyer, arrived at Burnley and investigated the event, deducing DeMarco's involvement from paint residue from DeMarco's car (as he had briefly crashed into a wall due to losing control of the vehicle while killing him). He then tracked DeMarco down to a nearby building alongside the other SWAT members (the dialogue suggesting they were aghast at DeMarco for killing him in front of the GCPD, as they realized it will likely make them seem even more guilty than before), and after interrogating DeMarco, left him to be arrested by the GCPD.