On June 12, 2016, Orlando Police respond to a gunman wreaking havoc inside Pulse Nightclub. Chaos unfolds as a bomb threat escalates the danger.

SWAT uncovers a bomb threat during the Pulse shooting. Officers risk their lives in a final confrontation with the gunman.

Detectives find a Playboy model's body in a suitcase. The prime suspect, her husband, escapes to Canada, triggering a nationwide manhunt.

Police find Kelley Clayton's dead body in her kitchen. Her husband has an alibi, but Clayton's oldest daughter says the attacker had "Daddy's eyes."

New tech innovations and old-fashioned detective work help police close the net on two perpetrators in this grisly murder for hire of a young mother of two.

When a rookie cop is shot point blank in Brooklyn, thousands of NYPD officers pull out all the stops to hunt the men who killed one of their own.

Detectives investigate the murder of a vibrant social media manager in her upscale apartment. Evidence points to a trusted figure with a violent past.

A mass shooting on a northbound subway train at rush hour leaves 29 injured. The NYPD goes all out to stop this urban terrorist before he strikes again.

With the subway shooter still at large, NYPD releases a photo of the suspect. The whole city is now looking for one man, as the police fear another attack.

In Port St. Lucie, officers pursue jewel thieves, sparking a multi-state pursuit. They uncover a lengthy criminal record, intensifying the race.