When a series of random murder victims are found on the streets of St. Louis, Rachel and the VCTF team believe the slayer is a military veteran who uses weapons of opportunity, and their focus shifts to an incoherent, ranting homeless person (guest star Jeremy Roberts)who fits the profile. However, Rachel wonders if she should widen her field of suspects to include any ex-serviceman -- and trained killer -- who is susceptible to an altered state psychosis. Back at headquarters, computer whiz George ignores his increasing reliance on prescription pain pills while recovering from a car accident.