After the First 48: Cold Justice

In Birmingham Alabama, a man is murdered in front of several witnesses, but for both police and prosecutor the simple case of cold-blooded murder becomes a cat and mouse game between the killer and justice. And in Memphis, Tennessee, an innocent bystander, trying to break up a fight is killed when he is caught in the crossfire. But the more police question the suspect in the shooting, the more he adamantly proclaims his innocence. Did the police actually have the wrong man?