The couples who commit murder together are not so rare. Of course, there is always a leader and a follower in those instances. But what happens when the law enforcement cannot pinpoint the blame on a single person and determine which one was the killer and who was the accomplice? The case of Christina Marcum and her ex-fiance Jason Singleton is a perfect example because each of them put the blame on the other person. It is still unclear what exactly happened on that January night in 2011, but both are locked up and serving their sentences.