The First 48

A North Charleston man asking for help at a stranger's doorstep dies from a gunshot wound to the leg and the search for the shooter leads in an unexpected direction.

In Gwinnett County, two best friends are murdered in a public park after setting up a meeting through Instagram.

After a mysterious motorcycle rider stalks and shoots down a Tulsa man, detectives must piece together the events leading up to his death to find out who wanted him dead and why.

A gunfight in a Tulsa apartment ends in a man's death, leaving Detective Mark Kennedy to sort through the truths and lies of the survivors.

A man is found lying outside his family home with a bullet in his head and Tulsa homicide must find a way to make the killer reveal himself. A man on a bicycle terrorizing a Mobile neighborhood senselessly murders a 51- year-old grandfather. A gunfight in the middle of a quiet Mobile neighborhood leads to a standoff between the SWAT team and a suspect inside a home with an 8-month-old baby. In Gwinnett County, a fight breaks out at a baby shower leaving a 39-year-old husband and father shot.

Detectives in major cities around the country race against the clock to solve homicides and use forensic evidence and witness interviews to help identify suspects.

Detectives in major cities around the country race against the clock to solve homicides and use forensic evidence and witness interviews to help identify suspects.