The First 48

When a potential spree killer targets the most vulnerable in Tulsa, Okla., Detective Max Ryden must stop the murderer before he kills again.

In Mobile, Ala., a man who turned his life around is gunned down in cold blood; detectives need to know if his troubled past came back to haunt him.

In Tulsa, Okla., a barrage of gunfire kills a man while he's sitting in his car, with his 2-year-old daughter in the back seat; an elderly Atlanta man is burned alive in a building fire suspected to be arson.

When a young man is found executed in the street and a second victim is shot nearby, Tulsa detectives scramble to track down the dangerous gunman before he kills again.

In Gwinnett County, a teenager is gunned down outside a nightclub when he winds up at the center of a gang feud.

In Mobile, Ala., a 68-year-old woman goes missing after checking into a casino where she had lost millions.

After his mother reports him missing, an Atlanta man is found dead, naked and shot twice in his bedroom.

In Atlanta, a woman is found dead in a garbage can and a young man is ambushed by neighborhood bullies.

When a young man goes missing in Tulsa, Okla., detectives must crack a family's code of silence in order to find him.

In Atlanta, a stranger guns down a new father in a parking lot; in Georgia's Gwinnett County, a man is stabbed more than 20 times when someone he trusts turns against him.

In Mobile, the murder of a 19-year old becomes personal when the team learns he is Det. Jermaine Rogers’ cousin. In Tulsa, a 31-year-old mother is gunned down in front of her home by an unlikely suspect.

In Mobile, a street fight escalates to a shooting that leaves a man dead on his front yard. In Tulsa, a drive-by shooting stemming from a gang feud claims the life of a 16-year-old girl, while her boyfriend clings to life.

Detectives investigate a drive-by shooting with dozens of shots fired that left a young man dead at his girlfriend's house in Mobile, Ala.; in Tulsa, Okla., a man is found dead from a gunshot wound inside of a crashed vehicle along a highway.

An innocent bystander is shot to death while trying to protect a young woman, so a team of detectives begin a new investigation to locate a shooter and bring him into custody before any additional casualties can take place.

When a father of three is executed on his front porch, Gwinnett County Homicide discovers that those closest to him are hiding a dark secret.

In Tulsa, Okla., detectives suspect a random roadside encounter when they find an unidentified cyclist gunned down in the middle of an intersection outside the airport.

In Tulsa, Okla., detectives suspect a random roadside encounter when they find an unidentified cyclist gunned down in the middle of an intersection outside the airport.