Season 4

A routine purchase may lead police to the killer of Laura Ackerson, a young mother whose body parts surface in an alligator-infested creek 1,200 miles away from where she was last seen.

Police find Jenny Webb hanging in an apparent suicide just days from giving birth to her first child; when things don't add up, investigators wonder if an unraveling love triangle and an unexpected pregnancy acted as a motive for murder.

An 8-year-old girl discovers her mother brutally bludgeoned to death in her home after her mom’s shift at a Vegas casino; police turn to surveillance video hoping to reveal the killers.

A killer stabs devoted father Jeff Wright 193 times and buries him in the backyard of his own home; investigators examine his background and their quest to find the culprit.

A desperate wife dials 911 to report a robbery after finding her husband, a father of three, shot in bed; evidence at the scene quickly leads investigators to the killer.

The brutal and public stabbing of a young high school teen shocks the community, and police quickly unravel the crime and motive through threatening voicemails and a long-simmering rivalry.