CSI: Crime Scene Investigation Episode 12.08 Crime After Crime

Three seemingly unrelated murders are linked by our CSI team and they discover a retired LVPD detective, dying of cancer, decides to complete a dark "Bucket List" of vengeance against the criminals who got away with their crimes on cases he worked on during his career. Given the detective is dying, our team knows there is an accomplice carrying out the revenge killings by making each pay for their sins in the same twisted ways that they hurt their victims. When the CSIs start to piece together this cop's crusade, they 're shocked to discover how the roots of the killing spree extend to other members of the LVPD.