Fisher was an SD-6 agent.
Fisher was only seen a couple of times inside the SD-6 HQ, conversating with Sydney and Arvin about a mission regarding infiltrating an asylum. Fisher went under the alias Dr. Fontanetta, transporting Sydney to the asylum.
While talking to one of the head doctors, the doctor noticed that Sydney was fighting with Martin Shepard, a man who knew vital information about a dead criminal's whereabouts. After Sydney escaped the pursing doctors in the asylum, she found Fisher resting in a chair, his throat slit open.