Traitor
From Official Barotrauma Wiki
Overview
Traitor is a random toggle-active side job that randomly selects 1 to 3 crew members normally, depending on the size of the server. The Traitors goal is to kill a certain person, and the job of other crew members would be to kill traitors. The Traitor does not have to kill the target silently, but living after the target dies will effect the end-of-round message.