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Though wedded couples vow to stay together until death do they part, a look at what happens when a groom or bride causes their beloved's death.
Savannah and Trent Paschal were a loving couple until her new job led to jealousy, suspicion and a tragic event captured on camera - sparking a nationwide manhunt.
Louisiana attorney Chiquita Tate was murdered in her office in February 2009. Her husband Greg Harris is now serving a 40-year prison term, without the possibility of parole.
Tim and Barbara Pasa were married for 18 years when emergency services were called to their home after a tragic accident caused by a lit candle - but a darker truth emerges.
In the wake of an abusive relationship, Susan Fortune moves to Albany, Georgia, for a fresh start. Soon after, she weds Jake Embert, but the marriage ends in tragedy. (S4, ep 4)
Christina Harris makes a shocking discovery, followed by a deadly plot, that gets blown wide open when a mother's frozen breast milk cracks the case. (S4, ep 5)
Lulu and Ramon Sosa find they make a good team and marry. But the FBI are tipped off that one of them has hired a hitman and concoct a plan to catch the killer. (S4, ep 6)
Rebecca and Lee Cawthon enjoy inviting others into their relationship. But this arrangement turns sour and there are fatal results. (S4, ep 7)
When Toni meets Harold at a convention, they click and soon marry. But money starts going missing from Toni's account and suspicion falls on Harold. (S4, ep 8)
Seven years into Ashlea and Emmett's marriage, there is an incident involving a gun. As police get to work, a web of lies - involving an affair - comes to the fore. (S4, ep 9)
After being pursued by Kevin Lewis, Amanda can't wait to marry. But a different side to Kevin emerges and she asks for a divorce, sparking a shocking turn of events. (S4, ep 10)