Cynthia Wilder claimed she and her husband, Richie, murdered his ex-girlfriend over custody issues.

Cedric Marks is on death row for the double murder of Jenna Scott and Michael Swearingin — but he’s also been linked to the disappearance and murder of April Pease.

When honors student Monica Diaz, 16, met boyfriend Michael Naranjo, 17, in a high school ROTC program, their connection quickly turned sinister.

A criminal fell hard for a suburban mom and was willing to do her bidding — even if that meant murder, as seen on Snapped: Killer Couples.  

When a Gulf War vet and his girlfriend befriended a “beautiful” but troubled teenager in a local bar, jealousy led to murder on Snapped: Killer Couples.

“Sometimes you can be sleeping with a snake and don’t even know it,” said the family of slain nurse Carla Knowlton on Snapped: Killer Couples.

Take a look back at the 2010 case of 24-year-old Jennifer Pan, a woman accused of trying to have her overbearing parents killed, as once featured in Oxygen's Snapped: Killer Couples. 

When an accomplice to murder "crumbled like a rose petal in August and confessed," the deadly dynamics of Patricia Sexton and her Texas clan shocked police.

“She trusted in him, and she figured he’s done some things, but [was] willing to look past it in the name of love,” childhood friend Dylan Aller said on Snapped: Killer Couples of Amanda Noverr, who helped her husband murder retirees on vacation.

The murder of Susan Bailey was sparked by a complicated relationship among teenagers that involved threesomes and drinking each other's blood.

“They were an explosive couple that each fed off the other and I don’t think the crime would have happened without the passion they had,” defense attorney Kevin McCants said on Snapped: Killer Couples of Shanika Robinson and her boyfriend, who helped to brutally murder her brother-in-law.

“The murder happened in her home, and she had to have known about it,” Robbie Fox, former Sevierville police chief, said on Snapped: Killer Couples, as Shayne Lovera claimed she was innocent. “There was no way for her to get around that.”

“I just couldn’t believe it,” Curtis Smith, Aaron Friar’s friend, said on Snapped: Killer Couples of the plot hatched by the teenager to kill her father. “You know, little girl Ellie—I couldn’t believe it.” 

Snapped: Killer Couples is returning for a new season on Oxygen True Crime. New episodes feature the murder of a beloved professor and a man found dead on the banks of a Georgia river.

Nicholas Godejohn spoke out about alter egos he explored with Gypsy Rose Blanchard on an episode of Oxygen’s Killer Couples.

Oxygen’s Killer Couples took a deep dive into the Gypsy Rose Blanchard case as experts and people who worked the case weighed in on whether Nicholas Godejohn was manipulated into murdering her mother in 2015. 

Gypsy Rose Blanchard and Nick Godejohn debated several methods of killing Clauddine "Dee Dee" Blanchard, Godejohn said in a revealing interview.

Nicholas Godejohn, convicted of murder in the fatal stabbing of Clauddine "Dee Dee" Blanchard, says he was lonely and isolated as a child.

Eli Weaver knew divorce wasn't an option for his devoted Amish wife, Barbara — so he turned to his lover to find a way to get her out of the picture.

Police accused Hunter Carlstrom and his pregnant fiancée, Xaveriana Cook, of stealing from and fatally shooting Carlstrom’s coworker, James “Caveman” Sartorelli.