Every Mother's Son - S3.E9

Pembleton and Bayliss investigate the shooting of a young boy. During the investigation, the mother of the victim meets the mother of the shooter in the aquarium. The shooter shows no remorse for the killing, although he shot the wrong kid. Munch, Bayliss and Lewis can't remodel the bar when they discover it's been classified a historical landmark. Then when they find out back taxes are due on the building, which shuts them down before they open. Beau finds out his kids are in Upper Darby, Pennsylvania, so he goes to find them.