David Packer

Warrick must overcome vindictive feelings when investigating a drive-by shooting in his old neighbourhood, and Nick cannot find witnesses to a murder at an Internet company.

Victims of a multi-car accident fill the ER; Carter learns the location of his surgical residency; Lewis and Chloe fight over the baby.

Cory and his friends receive their college acceptance letters.

Three United Nations delegates visit: a physician who is similar to Charles, an Army officer who teaches yoga and a Swede who catches Margaret's attention.

When the chief investigator of a controversial report documenting corruption within the NYPD is gunned down the day before his findings are published, Mac and Stella must find the killer, launching a massive search that makes every officer listed in the report a suspect.