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.

In Memphis, Sgt. Bart Ragland must find out who shot and robbed a family man.

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.

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 are investigating a home invasion that left a young man dead. Is their suspect just a young suburban mom, or a criminal mastermind? And in Cincinnati, a brutal stabbing ends the life of a hard-working grandfather.

In Memphis, the homicide team investigate the high-profile murder of a University of Memphis college football player found shot in his car near campus. In Tucson, detectives investigate the double murder of a married couple shot in their home.

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. And in Minneapolis, detectives investigate the murder of a young man shot on the street after a car accident.

In Detroit, detectives investigate a triple shooting that left a young mother and her friend dead. And in Dallas, a man is intentionally run down and killed by someone in a car.

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. And in Cincinnati, an elderly man is found strangled to death in his bedroom.

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

In Cincinnati, detectives investigate the murder of a 56-year-old man brutally beaten to death in the stairwell of his apartment building. In Dallas, the homicide unit investigate the murder of a 28-year-old singer found shot in his car.

In Dallas, a man is found dead in a vacant lot. With no leads, witnesses or motive, lead Det. Rick Duggan and his team must put the pieces of the case together.

In Dallas, two teenaged boys are shot outside a nightclub. As Det. Eddie Ibarra puts the pieces of the case together, he is temporarily pulled away to assist in the search of woman who has been missing for six days.

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 and including the conviction.

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 and including the conviction.