Haley Hotchner (Agent Hotchner's wife)
In this major arc episode, perennial villain the Boston Reaper targets Hotch's wife, Haley, and their son, Jack. The team rushes to the rescue, but it's too late for Haley. This episode is full of death: Sam is beaten to death by the Reaper; Haley Hotchner dies; and finally, The Reaper himself is put down by Hotch, who is distraught after the ordeal.
Watch Criminal Minds on CBS.