The First 48

In Dallas, Det. Rick Duggan investigates the murder of a young man shot in the backseat of his friend's car. And in Minneapolis, Sgts. Bruce Folkens and Chris Karakostas must find the person who savagely beat a homeless man to death.

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, gunned down in his home in front of his wife and children. And in Cincinnati, a gunfight in broad daylight ends the life of a 23-year-old 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. And in Birmingham, detectives are investigating the murder of a man gunned down outside the city's annual Magic City Classic football game.

In Minneapolis, after a night out with friends, a college student is stabbed to death while getting on his scooter to ride home. And in Miami, detectives investigate the murder of a teenaged boy shot in a residential backyard.

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 investigate the murder of a man found dead in the back of his burning pick-up truck. And in Minneapolis, a popular teenager is gunned down in a drive-by shooting while playing football in his front yard.

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 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.

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, detectives investigate the brutal murder of a young woman shot to death in a park in the middle of the day. In Minneapolis, detectives investigate the murder of a young man beaten and shot during a gunfight in front of a strip club.

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, a rookie detective is trying to untangle a love triangle that turned deadly. And in Dallas, lead detective Sayers and his team must piece together what happened inside a car that left the driver dead and a second victim critically injured.

In Louisville, a 33-year-old woman collapses in the street after being stabbed multiple times. And in Minneapolis, Sgts. Jerry Wallerich and Gerhard Wehr investigate the murder of a 19-year-old college student, shot down on a residential street.

In Birmingham, Det. Marcel Walker works to unravel the mystery of a 28-year-old man shot in his home. In Miami, Sgt. Ervens Ford and Det. Fabio Sanchez race against the clock to catch the killer of a homeless man found stabbed in a park.