Zach Garcia

When District 21 goes after a Colombian drug gang following a series of brutal slayings, an asset in the investigation emerges.

Voight's son may be involved with the Fitori murder case, intensifying tension between Antonio and Voight; Ruzek helps Burgess get retribution.

Platt and Voight discuss their pasts; Jin uses a scapegoat when he is caught tinkering with Voight's computer; Lindsay realizes she needs to come clean.

Antonio believes a Colombian gang is involved in his son's kidnapping; Halstead learns new information about Lindsay; Voight offers Antonio a new way to get information about Diego's whereabouts.

Lindsay, Halstead and Mouse search for a connection when two shootings take place in gang territory; a candlelight vigil is held for a young boy who was murdered in the first shooting.

When an undercover narcotics officer goes missing, Antonio is asked to help find him; Burgess and Roman ask Mouch (Christian Stolte) for help with a squatter situation.