The X-Files/Recap/S02 E13 Irresistible

When a girl's body is found exhumed and mutilated, local law enforcement suspects aliens and calls in the FBI. Although Mulder's interest in the case consists primarily of a pair of convenient baseball tickets, he gets a chance to use his skills as a profiler tracking a death fetishist turned serial killer. And his next target may be Agent Scully...

Tropes:

 * Disposable Sex Worker: Pfaster's first actual victim is a prostitute, but it's more because she was easier to get ahold of than because of her profession.
 * I Love the Dead: Pfaster again. The network wouldn't let the writers actually use the word 'necrophiliac', so they went with the next best thing and called him a 'death fetishist'.
 * Improvised Weapon: Scully temporarily blinds Pfaster with a spray can of tile grout.
 * Stoic Woobie
 * There Are No Therapists: Averted. Scully goes to see one to help her deal with her violent reactions to the case.
 * They Look Just Like Everyone Else: Pfaster is an excessively polite delivery driver for a frozen foods company.