The First 48: Deadly Misfortune

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

A gunfight in a Memphis, Tenn., motel leaves two men dead and another critically injured; an 8-year-old witness provides a lead in the investigation into the shooting death of a 2-year-old child.

In Miami, police attempt to find the killer of a good Samaritan who intervened in a robbery; a homeless woman may have information on the crime.

Dallas detectives hunt for a murderous car thief; brutal robbers gun down a young father in Atlanta; a double shooting on Bourbon Street has New Orleans residents on edge; a good Samaritan intervenes in a robbery and gets fatally shot.