The First 48

In Dallas, Det. Rick Duggan investigates the murder of a young man shot in the backseat of his friend's car. While scouring the crime scene, Duggan finds an interesting lead--mail.

Tucson detectives arrive at the murder scene of a young man gunned down behind an apartment complex. And in Dallas, a birthday party turns violent when a stray bullet from an AK-47 strikes down a teenaged girl.

In Dallas, Detectives Randy Loboda and Scott Sayers are investigating the murder of a 54-year-old family man.

In Tucson, detectives investigate the gruesome murder of a 58-year-old woman found naked and dead under a highway overpass. And in Birmingham, a community lives in fear after a teenager is senselessly shot in his apartment complex.

In Minneapolis, a young man is robbed and killed while meeting up with a girl he met earlier on a bus.

In Minneapolis, after a night out with friends, a college student is stabbed to death while getting on his scooter to ride home.

In Louisville, a Sudanese man who fled genocide in Darfur is shot to death while working in his clothing store. And in Birmingham, a young man is shot dead in his home. His girlfriend, also shot multiple times, struggles to survive.

In Birmingham, Detectives Jerry Williams and Chris Anderson investigate the murder of man found dead in the back of his burning pick-up truck.

Miami Sgt. Armando Aguilar and Det. Leo Tapanes are assigned the homicide case of a 20-year-old Rastafarian, shot and robbed on Christmas Day.

In Miami, a man is found dead on a residential sidewalk. The investigation, supervised by Sgt. Johnny Herrera, uncovers a tangled plot of false leads and secret lives--the victim's past proves as puzzling as his death.

In Birmingham, a motorcycle club president shot in the head after being run off the road. And in Louisville, Det. Cadwell races against the clock to catch the killer of a mother of seven, strangled to death in her apartment.

In Birmingham, Detective Chris Anderson and the homicide team investigate the brutal murder of a young woman.

When a 21-year-old father is gunned down in a parking lot in broad daylight, Louisville Det. Keith Roberts begins investigating one of the most brazen murders he has ever seen.

In Louisville, rookie detective Kristen Downs is trying to untangle a love triangle that turned deadly.

In Louisville, a 33-year-old woman collapses in the street after being stabbed multiple times.

In Birmingham, Det. Marcel Walker works to unravel the mystery of a 28-year-old man shot in his home.

In Louisville, a 45-year-old man is found gunned down in the snow. Det. Rick Arnold and his team track down a key witness who is forced to chose between her friendship with the suspect and her own freedom.