Detective Nick Williams looks into whether they have the guilty culprit after an eyewitness points out a potential suspect at a crime scene; an armed gunman hides in his apartment after killing two men; a man is shot at his sister's home.

Detective Ryan Vaught believes a homeless man was murdered in cold blood; Detective Drew Deacon finds a lead after a father is brutally shot; a gunman shoots an AK-47 on the highway; Detective Nick Williams talks to an at-risk individual.

A high school student in New Orleans gets shot on his way to school; a shooting suspect in St. Louis is found walking down the street naked; detectives in Tulsa, Okla., wonder if carjackers were involved in the murder of a single father.

When two boys find their mother in the back of her car, Tulsa detectives turn to her family for help catching her killer. At the defendant's trial, his explosive testimony leaves the prosecution's case hanging on one key piece of evidence.

When a father of two is shot dead while driving, detectives retrace his steps to figure out who killed him.

When hip-hop artist Chucky Trill is gunned down on a highway after leaving a nightclub, Gwinnett County Homicide mist retrace his steps to find the killer.

In Mobile, AL, one teenager is killed, and another's life is forever changed when a single decision turns fatal.

When a man is gunned down while walking his dogs in a quiet park, surveillance video leads detectives to an unlikely suspect.

A fateful choice tragically ends the life of an up-and-coming rapper.

When a young father goes out partying and ends up dead at a club, everyone knows what happened... but no one is talking.

When a man is found shot and dumped in the road, detectives learn how his struggle to overcome obstacles left him headed for a collision with someone on the edge.

In Gwinnett County, two brothers are murdered in their sleep. Detectives suspect they were betrayed by someone they knew.

In Tulsa, a friendly gathering takes a fatal turn when three people are shot and a teenager is killed.  In Mobile, a plan to settle a dispute backfires when a man is gunned down at a family member's house.

When a love triangle turns deadly, a killer enlists an unusual murder weapon.

When a 15-year-old boy is murdered after getting in over his head, detectives hope a Snapchat message can lead them to his killer.

When a hard-working construction worker is brutally murdered on payday, Tulsa detectives chase an unlikely suspect: the victim's best friend.

In Mobile, AL, a father of four is gunned down in a strip club when a chance encounter turns deadly.

In Tulsa, three people are executed in their ransacked home, and the woman who found them may hold the key to finding the killer.

In Tulsa, a homeless man is ambushed by two men on a dark trail, and his wife may hold the key to finding the killers.

In a crowded Mobile AL bar, surveillance video captures the shocking murder of a man after a game of pool.

In Mobile AL, when two beloved men from the Mobile Terrace neighborhood are gunned down, detectives need the community's help to get justice for their families.

Gwinnett County detectives chase down a bullet-ridden Toyota Camry to find who may have killed a beloved young man.

Old habits die hard when a young father gets ouf of prison and is drawn back into his old life.  After he's shot dead, Tulsa OK homicide must sort through a web of lies to find out who killed him.

In Tulsa, when a teenager is found murdered and dumped in a field, the leads run dry and detectives need your help to get justice for his family.

In Tulsa, a young father is shot several times in his driveway after putting his one-year-old daughter to sleep. Detective Jason White hopes a pill bottle found on the scene will help lead to the killer.

When three people are gunned down in a quiet neighborhood, Gwinnette County police struggle to find a connection between the victims.

The cold-blooded shooting of a man outside his apartment is caught on video, but detectives must work through the night to identify his masked attacker.