Episode 17 of "Criminal Minds"
s01e17 A Real Rain
Title: A Real Rain
Original Air Date: 03/22/2006 on CBS
Plot Outline:
Gideon, Hotchner and their team investigate a series of killings that appear to be the work of a vigilante. At first, the murders taking place in Manhattan seem random, but then the NYPD begins to fear that the serial killer is copying the infamous "Son of Sam." When the Behavioral Analysis Unit is brought in to help with the case, they discover a link between the victims that leads them to a vigilante taking revenge on criminals let go by the justice system.