The First 48

In Minneapolis, just days before Christmas, Sgt. Rick Zimmerman and Sgt. Tammy Diedrich are called to the murder of a young woman, found strangled in a partially burned car.

In Memphis, Sgt. Bart Ragland must find out who shot and robbed a family man. In Tucson, Detective Bill Hanson hunts two suspects who allegedly gunned down.

In Miami, Sgt. Louis Melancon and Det. Carlos Castellanos investigate the murder of two men savagely gunned down in the middle of a residential street.

In Tucson, Detectives Jennifer Whitfield and Mike Carroll are called to investigate the robbery/homicide of 27-year-old cab driver.

When a young man is gunned down outside a Cincinnati nightclub, witnesses see another young man running from the scene.

In Memphis, Lt. Toney Armstrong and his team respond to Memphis's worst mass murder in more than 15 years, where they find four adults and two children dead.

In Cincinnati, Detectives Keith Witherell and Bill Hilbert attempt to crack the code of silence.

In Dallas, Det. Robert Arredondo and his team investigate the murder of a 22-year-old man tied up and shot along with two of his friends during a robbery.

In Dallas, Detectives Scott Sayers and Ken Penrod are investigating a home invasion that left a young man dead.

In Memphis Sgt. Eric Freeman and the homicide team investigate the high-profile murder of a University of Memphis college football player.

In Memphis, Sgt. Debo Carson and her team investigate the murder of a man shot dead outside of his house.

In Memphis, Sgt. Connie Justice investigates the homicide of a man found bludgeoned to death in his apartment.

In Detroit, Sgt. Gary Diaz and Officer Kelly Mullins investigate a triple shooting that left a young mother and her friend dead.

In Tucson, a grandfather is shot after answering a knock at his front door. The suspect's getaway car crashes a few blocks from the crime scene and the suspect flees.

In Minneapolis, Sergeants Bruce Folkens and Chris Karakostas work against the clock to solve the murder of an unknown homeless man, bludgeoned to death.

In Dallas, two teenaged boys are shot outside a nightclub--one is critically wounded, the other is left in a coma.

Now that some of our strongest cases have been adjudicated, we can take viewers inside the powerful and dramatic events that unfolded after the arrest.

Now that some of our strongest cases have been adjudicated, we can take viewers inside the powerful and dramatic events that unfolded after the arrest, up to the conviction.