S4, E18: BAU agents go to Boston to search for one of the most notorious serial killers in New England, who strikes again after a 10-year hiatus.

Starring C. Thomas Howell,  Louis Ferreira,  James Hanlon 

S4, E18: BAU agents go to Boston to search for one of the most notorious serial killers in New England, who strikes again after a 10-year hiatus.