Watch The First 48: Deadly Misfortune

In Miami, police try to locate the killer of a good Samaritan who intervened in a robbery; a homeless lady may have information on the crime.

A gunfight in a Memphis, Tenn., motel leaves two men deceased and another critically harmed; an 8-year-old witness gives a clue in the investigation into the shooting death of a 2-year-old kid.

Detroit police respond to a double shooting in a vacant lot; a shooting victim is dumped in a downtown Dallas park.

A crew of robbers guns down an Atlanta father; a detective working her first case suspects that she may be pursuing the wrong suspect.

A double homicide on New Orleans' Bourbon Street puts the city on edge; Tulsa, Okla., investigators believe that a shooting victim may have been seduced into a trap.

A police detective wants to find the murderers of two Miami men before the bloody turf war takes another victim.

Two teenage boys are shot outside a nightclub in Dallas; police search for a woman who has been missing for six days.

A murder victim's friends hinder the investigation of the crime; a stray bullet from an AK-47 kills a teenage girl at a birthday party in Dallas.

A bystander dies when a brawl at a Charlotte, N.C., nightclub turns into a gunfight; police pit brother against brother in an effort to solve the crime.

An innocent bystander dies in a drive-by shooting; police work with the intended target to locate the parties responsible for the crime.

Dallas police detectives race against time to locate a car thief who fatally shot a man and stole his vehicle.

A bystander dies when a brawl at a Charlotte, N.C., nightclub turns into a gunfight; police pit brother against brother in an effort to solve the crime.

A shooter kills an elderly Texas woman while she unloads groceries from her car; police learn that the teenager suspected of the crime has a long history of violence.