[s4e23] Roadkill Guide

is the 23rd episode of the fourth season of the crime procedural series Criminal Minds , which originally aired on May 6, 2009 .

: This episode marks one of the early cases after Jennifer "JJ" Jareau returns from her maternity leave. [S4E23] Roadkill

The episode follows the Behavioral Analysis Unit (BAU) as they travel to , to investigate a series of vehicular homicides. The "Unsub" (unknown subject) uses a modified, heavy-duty truck as a weapon to run victims off the road or crush them. Key Plot Elements is the 23rd episode of the fourth season

: David Rossi takes a lead role in empathizing with the suspect's physical limitations to help narrow down the profile. Notable Guest Stars Craig Sheffer : Portrays the Unsub, Mason Weaver. If you are looking for more specific details, The ending/climax of the episode. The "Unsub" (unknown subject) uses a modified, heavy-duty

: The killer uses a specific stretch of highway known to locals as "Suicide 7" because of its dangerous, winding nature.

: Penelope Garcia helps the team by tracking the specific modifications made to the Unsub’s vehicle, which was customized with hand controls to allow him to drive despite his paralysis. Character Highlights