Fiend

An evil spirit Possesses the corpse of a diseased man. It must absorb the life energy of the living, in order for the corpse to not rot away. It moves to the suburbs, where, a neighbor begins to suspect something isn't right.
An evil spirit resurrects the corpse of a dead music teacher, who now must strangle and absorb people's energy in order to stay alive. When he moves to the suburbs of Baltimore and resumes giving music lessons, he begins to cause suspicion amongst his neighbors.