Crossroads

S4 E24: While investigating the disappearance of a former assistant district attorney, Jack talks to her boyfriend, Alan Davis (Jason Priestley - "Beverly Hills, 90210," "Tru Calling"). When Davis senses that he is in fact a suspect, he goes berserk and causes a shootout in the FBI offices. And in the incident's aftermath, the detectives must continue trying to solve the case, with an added sense of urgency.