Jeremy Fisher was a corpse from World War I that was dug up and later infected by Hubert Cumbidale, as an infector.
Not much is known about Jeremy Fisher other than he fought in WWI for Britain.
Jeremy fisher was dug up after the war and left to rot for years until the Brethren Moons found Earth and infected it. Hubert Cumbidale found the body when hiding from the Necromorphs, but left the him. Hubert Cumbidale became infected and turned into an infector and turned Fisher into a Slasher.