Ep 2. Challenged

Rick Devon's (guest star Bradford Cover) body is found murdered in a park, and his death is automatically assumed to be drug related. Upon investigation, detectives Cyrus Lupo (Jeremy Sisto) and Kevin Bernard (Anthony Anderson) stumble upon a key in a nearby bathroom that could potentially have been left behind by the killer. Prints on the key lead the detectives to former felon, Diego Cardenas (guest star Carlos Leon), who has cleaned up his act and now works at a home for mentally challenged adults.