Scully tell Doggett that while the DNA test disprove Fassl 's culpability , it implicate a possible blood relative ; Fassl , however , is an only child . Reyes propose that the murders are being conducted by an entity rather than a person . Meanwhile , Fassl approach Assistant District Attorney Damon Kaylor and begs to be sent back to prison . Kaylor refuse , but is killed by the Bearded Man . After hearing of Kaylor 's disappearance , Reyes theorize that Fassl 's piety and his unwillingness to acknowledge his darker half have given him the unwanted ability to physically change into another , more violent person .