WBXX-DT

The investigation into the murder of a sex offender leads to a private police force operating independently of the Chicago PD; Halstead checks Jimmy's DNA to find out if he really is Lindsay's father.

The details of a kidnapping are similar to a series of rapes and murders that may link the crime to a serial killer.

Mike tries to stay safe and not violate Danbury's unwritten rules; Jessica and Harvey try to land a whale; Louis looks for an office tenant; Rachel goes up against a student.

Joanne's family member told her she slept with Joanne's husband, Jordan; months later, a friend told her she saw Jordan and her family member driving around town.

Shawniece says Marcus told her he had a job interview, but when he returned home, she found messages on his phone from another woman, and when she reached out to her, the woman said she slept with Marcus.

When one of 51's own gets injured on a call, Severide becomes obsessed with helping out; Foster contemplates a big decision; Kidd is concerned for one of her high school trainees.

Paid programming.

News about dogs, including shows and current events; from the American Kennel Club.

Highlighting inspiring people who are making a difference across America.

Ford; Chevy; hot rods; trucks; muscle cars.

Unique cars with interesting histories.

Learning about safe water and cancer research.

Watching whales on Catalina Island; Jack meets a humpback whale, fin whale, dolphins and sea lions.

Jack goes to the Umfolozi Big 5 Game Reserve in South Africa for amazing animal encounters.

The Fiji Islands: using vines to catch fish; creating colorful pearls; the blue-footed booby.

Conservationists at the Loggerhead Marine life Center work to save endangered sea turtles; a nesting leatherback on the beach; a rehabilitated loggerhead is released.

Jack embarks on a safari through Florida's Everglades, where he encounters alligators and rattlesnakes; a rare look at the Native American traditions of the Seminole Tribe.

Jack's adventure to the Serengeti unfolds with a look at the great migration of wildebeest and zebra; Jack encounters elephants and lions; an African rock python; and visits a local school.

The award-winning travel journalist takes picturesque tours around the world.

Paid programming.

From Indianapolis Motor Speedway in Indianapolis.

From East Hampton, N.Y.

A pre-race lead-up to NASCAR racing.

The NASCAR Xfinity Series Pennzoil 250 takes place at the Indianapolis Motor Speedway as part of Brickyard Weekend. The drivers must conquer the 250-mile racecourse broken down over exactly 100 laps around the 2.5-mile asphalt layout.

Jerry, Elaine, George and Kramer have unique experiences on their subway rides.

George worries over gaining the upper hand in his current romance.

Friends, family and colleagues discuss the life and career of comic Chris Farley, the popular star of "Saturday Night Live" and numerous films.

Stay informed with the latest breaking news and headlines.

The temperature is high and tensions are even higher when the crew has to execute an advanced elevator rescue during a heat-induced power outage.

A teenager speeds out of control on the freeway; a routine traffic stop uncovers a shocking kidnapping; Buck struggles with his recovery.

Paid programming.