Defendant asked her ex-husband to kill her brother, and he did so. That's pretty rare. Usually you don't kill your brother. Even then, you usually don't get your ex-husband to do it.
Also unusual: the brother was only 16 years old. Not your typical murder victim.
Add to the complexity: The motive for the murder was, in part, the prior sexual relationship. Between the sister. And the brother. And the ex-husband. All three.
For these and other sordid details, check out the opinion.