The First 48

A potential spree killer targets the most vulnerable in Tulsa, Okla.

In Mobile, Ala., a man who turned his life around is gunned down in cold blood.

A barrage of gunfire kills a man while he's sitting in his car; an elderly man is burned alive.

Tulsa, Okla., detectives scramble to track down a dangerous gunman before he kills again.

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.

A stranger guns down a new father; a man is stabbed when someone he trusts turns against him.

A police detective's cousin is murdered; a 31-year-old mother is gunned down by an unlikely suspect.

A street fight escalates to a fatal shooting; a drive-by shooting claims the life of a 16-year-old.

A rookie detective struggles to unravel the mystery of a teenager found naked and shot to death.

An innocent bystander protecting a young woman is gunned down.

When a father of three is executed, detectives learn that those closest to him are hiding a secret.

Tulsa, Okla., detectives find an unidentified cyclist gunned down in the middle of an intersection.