Fatal Vows

The bodies of retired Navy commander Bob Klosterman and his wife Becky were discovered shortly after the seemingly perfect couple began divorce proceedings.

When Nancy Lyon dies mysteriously in hospital, suspicions immediately fall on her husband Richard. Were there cracks in a model marriage or is another suspect to blame?

After a whirlwind romance, Angelo Heddington and Elizabeth Rudavsky's relationship is filled with escalating violence that culminates in a tragedy - and a shocking discovery.

The convoluted case of married couple John Pitman and Tracey Richter, involving missing pets, threats, and a dead neighbour.

Wealthy couple Kraig and Karen Kahler live a life of privilege in Weatherford, Texas. However, on Thanksgiving day, 2009, Kraig kills his wife, two daughters and grandmother-in-law.

The picture-perfect married life of Donna and Dr Gulam Moonda was destroyed by a mystery gunman - but investigations revealed infidelity, drug abuse and a shocking act of betrayal.

Working class couple Karon and Chris Pugh lived an idyllic seaside life in Wales - until Chris discovered Karon's infidelity and battered her to death with two hammers.

Daryl and Della Sutorius lived in a luxurious neighbourhood, but deadly secrets hid behind closed doors, where Daryl had taken to wearing a bulletproof vest - but was still found shot.

High school sweethearts Bob and Liana get married when Liana gets pregnant, but happiness soon leads to despair - and a cold and calculated double murder.

When Pauletta Burleson is killed, evidence points to her husband, Pastor Tracy Burleson - but investigations uncover infidelity, abuse and corruption.