Ariz. Hammer Murder Trial Echoes Jodi Arias Case

A woman on trial in Phoenix claims she beat her husband with a hammer in self-defense.
3:00 | 04/02/14

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Transcript for Ariz. Hammer Murder Trial Echoes Jodi Arias Case
defendant as a cold, calculating killer, starting with the interrogation tapes. Dubois hours is seen laughing awkwardly describing events of the night. Her strange behavior, not far off from Jodi Arias' conversations with herself. You should have done your makeup, Jodi, gosh. And hands stands. And the blame game. She said she saw her roommate murder her husband, only to change her story to self-defense. So Stan didn't have any -- Stan wasn't even in the room? Not until after I had already hit him. Arias had three stories. First, she wasn't there. I was nowhere near Mesa. I wasn't even close to him. Then masked robbers killed her husband. There were two people there. One was a guy and one was a girl. What did he say? The girl wanted to kill me, too. Before event cruelly asserting self-defense. Which story do you want to believe? And even that defense bears similarities between the two cases. Both claim they were victims of a pattern of abuse, a claim known as battered women's syndrome. But why Dubois had a witness to the abuse, her teenage daughter, Arias had no witnesses. What are the parameters of this kind of defense 1234. There was an expert who said she suffers from PTSD. And that's consistent. We saw this in the Jodi Arias trial, if you're suffering from PTSD, maybe a jury will buy it that you just kind of snapped. She said you yelled something. But there are a lot of people with PTSD, so it's not necessarily a strong defense. And then there's the crime scenes. In the Arias trial, the brutal crime scene displayed prominently throughout the trial. And in the Dubois case, the jury is shown these replicas of her husband's skull, evidence of a savage attack. With each blow of that hammer, she's knocking chunks of bone out, she's smashing chunks of bone that have already been broken. But significance differences in these two cases. In the Dubois case, the motive, nothing at all like the spurned lover Jodi Arias was. Why were you still acting as his booty call? I made a string of bad choices. Prosecutors say Dubois hatched a life I shurnsurance money. She likes money. But more than that, she likes easy money. Once all that money was in place, she set her plan into action. Se she her pl she set her man in action to kill. Money to pay back the man she was having an affair with, the man whom she borrowed hundreds of thousands of dollars. She's not very likable. How does that play into her PTSD claims? Don't you have to have sympathy in order to try to buy that argument? Yeah. That's a good question. You know, a lot of people will think that if you're a battered woman, then you're weak because you should be able to walk away. And that's not necessarily the case. However, this is a woman, Marissa Dubois, who is strong. She was able to lead a double life. One of the most powerful piece of evidence, the dependent's own hands. Her perfectly man cured nails and light bruising show little struggle between Dubois and her husband. Doesn't appear to be any defensive wounds on her at all. Tonight, Dubois' fate is in the hands of the jury. While she sits in the same jail a as jodis9< Arias. They've reportedly become friends. What are the questions they will be asking themselves? They will probably be trying to put themselves in Marissa Dubois's place in the bedroom the night she killed her husband. And that's the question. Dubois faces the death penalty if convicted, as does Jodi Arias who was found guilty of murder but has yet to be sentenced. We the jury do find the defendant as to count one guilty. Death penalty on the table in this case. What do you think the possibility is that she will get the death penalty? Prosecutors don't seek death against women that ├▒ioften, you look at who they kill, they primarily kill their children, their lovers, their husbands. They usually kill people they're emotionally tied to. For "Nightline," I'm Ryan smith in New York.

This transcript has been automatically generated and may not be 100% accurate.

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