[s4e23] Roadkill Link

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

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 [S4E23] Roadkill

: 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. is the 23rd episode of the fourth season

: This episode marks one of the early cases after Jennifer "JJ" Jareau returns from her maternity leave. Key Plot Elements : David Rossi takes a

that may have inspired this "vehicular heat" storyline.