Byron Smith, 64, led authorities to his Little Falls, Minnesota, basement where the bodies of Nicholas “Nick” Brady, 17, and Haile Kifer, 18, lay wrapped in tarp.

The body of 54-year-old Don Fluitt was found mutilated in his Albuquerque garage, prompting police to question multiple men with separate potential motives. 

Doug Carlile was shot dead in his Washington state home, but that wouldn't be the only horrific crime traced back to James Henrikson. 

Lauren Giddings was 27 when she vanished after a night out with friends, her torso later found in a trash bin steps from her Macon, Georgia apartment building.

After John Altinger vanished, details found in a 40-page story narrated by an aspiring serial killer led to Altinger's murderer, and his body. 

Two months after Karen Lofton and her daughter Karissa, 16, were fatally shot in their Maryland home, the burned bodies of Delores DeWitt and her daughter, Ebony, 19, were found in a car trunk. 

Eric Williams, a former justice of the peace, and his wife Kim almost got away with killing three people in Texas, but a secret storage unit helped crack the case.

Kim Dorsey, 38, was found dead in her Jacksonville bedroom by her firefighter husband, who’d returned home from a 24-hour work shift. A broken pool cue, knife and gun were found nearby.

Want to know how Dateline: The Smoking Gun differs from Dateline: Secrets Uncovered and Dateline: Unforgettable? Read on. 

The new Oxygen series tracks the twists and turns of investigations, leading to the smoking gun that cracks the case.