Dateline investigates the mysterious deaths of 6-year-old Max Shacknai and 32-year-old Rebecca Zahau.

A soon-to-be bride is caught in the middle of a twisted murder plot that has detectives questioning if she played a role in it.

A wave of threats hits Chicago and Firehouse 51 finds itself in the middle of a dire situation.

Severide attempts to help chili with her recent struggles and Borelli steps into the ring to represent Firehouse 51.

She was tiny but energetic -- and very much in charge.

The parents of a missing South Carolina woman speak out about her disappearance.

A teenage boy on a manic rampage kills two star basketball players then tries to kill himself, and his defense is a failed course of psychiatric treatment and drugs.

A psychiatrist with unconventional methods is found sexually assaulted and unconscious in a crack house, and it's easier said than done to get her to cooperate with the investigation.