Special investigator for the FBI. Brought in and used by Jack Crawford to catch serial killers. Has a "unique" relationship with Hannibal Lecter.
Will has a special "gift" (he considers it a curse) which allows him to visualize and enter the mind of a serial killer and create a unique perspective that nobody else can which aids in the capture of the perpetrators. Unfortunately using this talent disturbs and scares him to the point of mental instability.