This is the second part of the story arc that combines the Cold Case team and the FBI in tracking a serial killer.
The team partners with the FBI in an attempt to apprehend a serial killer before he shoots his next victims. On April 4, "Cold Case" will air the second part of a two-episode arc that involves guest star Susanna Thompson as an FBI agent who takes the case personally.
In this week's episode, viewers learned that a tough FBI agent with ties to Stillman shows up to enlist the team's aid in finding the killer who has eluded her for 30 years. It turns out that FBI Agent Diane Yates has a hidden agenda in finding the murderer - to get a revenge for having her marriage ruined by the killer.
Next week in the conclusion episode called "Bullet", after determining the serial killer's identity - and some of his likely future targets - the team and the FBI work together to apprehend him while trying to locate and protect the people he's preparing to kill.