S4 E1 • Amanda and Grant Hayes

A nasty custody battle leads to the brutal murder and dismemberment of a North Carolina mother.

S4 E2 • Brittany Smith and Jabrai Copney

A Harvard University student's relationship with a bad boy leads to her involvement in the conspiracy to rob and kill a local drug deale

S4 E3 • Michelle Michaud and James Daveggio

A California couple embarks on a torturous journey in their minivan that ends with a 21-year-old woman's murder.

S4 E4 • Sara Aldrete and Adolfo Constanzo

When a Texas fraternity brother goes missing on spring break in Mexico, local police discover a deadly cult with many victims.

S4 E5 • Carol Bundy and Douglas Clark

A twisted couple's depraved sexual fantasies result in a series of murders of prostitutes on the Sunset Strip in Los Angeles.

S4 E6 • Charlene and Gerald Gallego

Sociopathic lovebirds kept teens as sex slaves and then murder them in Sacramento, California.

S4 E7 • Mona Watson and Michael Howell

An ex-con and a victim of domestic abuse turn into a modern-day Bonnie and Clyde.

S4 E8 • Donna and Jason Slaughter

A couple's twisted scheme is exposed when they conspire to murder the husband's secret gay lover.

S4 E9 • Nancy Rish and Jason Edwards

A successful businessman from a prominent Illinois family is kidnapped, held for ransom, and buried alive.

S4 E10 • Dawn Godman and Justin Helzer

A California woman meets a man and his brother, form a religious cult, then go on a killing spree across the state.