[s4e23] Roadkill -

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

is the 23rd episode of the fourth season of the crime procedural series Criminal Minds , which originally aired on May 6, 2009 . [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. : This episode marks one of the early