Twenty-four-year-old Nathan Trapuzzano is shot dead during his morning walk, leaving his pregnant wife a widow. Security footage from the scene reveals the final shocking moments of Nathan's life but will it be enough to help police hunt down the killer?

Visiting family in Shreveport, La., Tosha Lampkin disappears after making a late-night trip for food, then her burnt-out rental car is discovered along with her remains; CCTV cameras provide detectives with their only lead on her killers.