Season 8: Episode 11 - Perennials

Perennials: The BAU heads south in order to investigate a fast moving UnSub who kills his victims with a chisel and leaves maggots at the crime scene. He also forces the people he kills to bite down on a wooden stick as they die, a signature that matches a spree killer from thirty years ago. The team soon discovers that the UnSub believes himself to be the reincarnation of the old killer and he believes his targets are the reincarnation of the old killer's victims. After solving the case, the team learns that an UnSub nicknamed ‘The Replicator’ is tracking the BAU and replicating crimes that they solve.