Snapped: Killer Couples, Laura Martin and Robert Quinn

A North Dakota community is rocked after a beloved mother is found stabbed to death in her home. As police look to those closest to her for answers, an informant comes forward and exposes a dangerous couple's vengeful plot.

Just months before his retirement, a missing trucker's body is found in a remote creek. As detectives run out of leads, a seemingly minute detail breathes new life into the investigation revealing two lovers with a nefarious plot.

When a crime spree leaves five dead, South Carolina authorities kickstart a multi-state investigation to capture a desperate couple on the run. The case grows more complicated when police are faced with conflicting accounts of the murders.

After a young mother is murdered in broad daylight, Texas authorities are on a hunt for a masked gunman. The ensuing investigation uncovers a bitter custody battle and a vicious plot born of obsession.

A welfare check confirms the worst when a woman is found brutally murdered on her couch. The ensuing investigation leads authorities from Oklahoma to Arkansas where conflicting stories of a crime motivated by greed and jealousy are uncovered.