Police are stunned after investigating three murder cases where the victim and killer share blood.

In this episode, hatred and greed lead four killers to enact their revenge.

Despite trying to work things out in a healthy way, three people turn to murder to sort out their problems.

In this episode, startling cases of overkill prove that you can't trust everyone.

Investigators are stunned when three murder cases end in betrayal by the ones the victims called friends.

Young love turns deadly for three couples when jealousy and greed turn their relationships sour.

Affairs, rage and greed lead investigators down twisted roads all leading to murder.

Investigators dive into cases of love and betrayal by the people that three victims trusted most.

Til' death do us part comes sooner than later in these three chilling newlywed cases.

When a hooded man shows up, Pamela Lawson thought he was her boyfriend's friend. But, the shadowed figure was her co-worker who had come to kill the man she alleges abused her.

The brutal slayings of wealthy families leave investigators wondering who stands to benefit from the family fortune.

Couty Alexander calls police saying that he found his wife, Christa, shot. However, a gap in his story proves he is the one that pulled the trigger.

When Linda Culbertson calls police about an invasion at her workplace, they assume she is a victim. However, police discover that Linda hired two men to stage the attack.

When three neighbourhood feuds turn deadly, investigators discover years-long arguments over land, rumours, and deer.

When a neighbourhood quarrel boils over, Billy Woodward decides to strike first. Billy crawls across the street and opens fire, killing two and injuring one.

When Devon Guzman is found with her throat cut, investigators think her girlfriend is to blame. However, her ex-girlfriend Michelle and her husband, Brandon, are the attackers.

Real estate tycoon Gary Triano is dead after his car explodes. His ex-wife, Pamela Phillips, is to blame when police discover her plot to receive his life insurance policy.

Three shocking tales of betrayal and murder. First, a mass shooting on the University of Alabama campus leaves the country in shock.

When Jennifer Pan calls police about a home invasion killing her parents, investigators think she's innocent. That is, until her story doesn't add up and proves she is the killer.

Sarah Ludemann and Rachel Wade are dating the same boy. Instead of being mad at him, they take out their revenge on each other, leaving Sarah stabbed to death in the street.