Transcript for Jodi Arias Murder Trial: Defense Begins Case
Let's get to the first in the breakup of the murder trial. The defense of jodi arias is expected to begin today. Her lawyers will argue that she was trying t protect herself when she stabbed her ex-boyfriend to death. We're going to talk live to dan and nancy in a moment. But ryan owens has the latest on the story. Reporter: Fatal attraction? Or self-defense? Just hours from now, jodi arias' defense will begin. Did she kill her boyfriend in a jealous rage? Or did he die while jodi was fighting for her own life? Jodi would live or she would die. Reporter: The prosecution has laid out every gruesome detail of how mormon businessman travis alexander was killed. After initially lying to police, arias finally admitted to stabbing him nearly 30 times and shooting him in june of 2008. Jodi, this is over. This is absolutely over. You need to tell me the truth. Listen, the truth is I did not hurt travis. Reporter: First, she said she wasn't there. Then, she was and witnessed intruders kill him. And finally, the version her attorneys are now telling the jury, that arias killed alexander in self-defense. The defense is going to come in and clean up this mess of her multiple stories and explain that in some kind of a narrative. Reporter: Domestic violence experts will testify to try to explain away her lies. And ultimately, most expect jodi arias, herself, will take the stand. For her to get up in person, on the witness stand, and tell a story and show emotion, and paint the picture of a woman abused, is the s potential defense they have here. Reporter: Arias could face the death penalty if convicted. For "good morning america,"n owens, abc news, phoenix.
This transcript has been automatically generated and may not be 100% accurate.