In CBS' Criminal Minds Season 8 finale, the elusive Replicator, portrayed by guest star Mark Hamill, emerged, wreaking havoc by targeting Strauss and exposing deep knowledge of the BAU. The Replicator drugged Strauss, leading to her death, and showcased his intelligence by hacking Garcia's system and revealing sensitive details.
The pursuit of an inside job theory intensified as Hotch discovered top-level DoJ involvement in monitoring the BAU. After suspecting Alex Blake's connection, the team identified John Curtis, a disgruntled former G-man. Curtis, holding Blake captive, detailed his resentment and set a booby trap.
A dramatic rescue ensued, with Rossi cleverly using Strauss' one-year sober chip to trap Curtis, resulting in a explosive conclusion at Curtis' farm. The finale concluded with the team, in a somber contrast to JJ's wedding last May, gathering to remember Strauss and acknowledge the challenges faced throughout the hard year.