Two intruders stormed into the Douglass house in October 1979, robbing the family and chillingly shooting all four as they lay face down on their living room floor.

Dateline reporter Dennis Murphy described the mastermind of the gruesome plot to kill young parents Josh Niles and Amber Washburn as "perhaps the most villainous killer" he's ever come across. 

Lissa Yellow Bird spent years tracking down missing Indigenous women, until one day her own niece Carla Yellow Bird disappeared, sparking a very personal mission to bring her back home. 

Amy Mihaljevic had agreed to meet a man she believed worked with her mom to buy her a special present when she disappeared in October of 1989. Detectives are hoping someone has the key to solving the mysterious case.

Dateline: Unforgettable's Keith Morrison described the terrifying mystery as “unlike anything I’d ever seen." 

Kathleen Peterson was found at the bottom of the staircase in her lavish North Carolina home in 2001, but the mystery around her death continues to endure. 

Denise Leuthold was just 39 years old when she was gunned down in the entryway of her Peoria, Illinois home on Feb. 14, 2013.

California mom LaJoya McCoy believed someone was stalking her during the last days of her life. 

“I don’t feel any different. And I don’t think about it,” a disappointed Liam McAtasney told a friend of how little the murder of Sarah Stern impacted him.

During a vicious custody battle, Christine Metter turned to her father — and a Facebook friend — for help concocting a disturbing scheme.