Jodi Arias Doesn't Remember Stabbing Ex-Boyfriend

The woman on trial for her ex's alleged murder finally testified about the day he died.
2:14 | 02/21/13

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Transcript for Jodi Arias Doesn't Remember Stabbing Ex-Boyfriend
Let's get right to the new drama in that so-called breakup murder trial. After more than a week on the stand, jodi arias' emotionally testifying about what happened the night her ex-boyfriend died. Abc's ryan owens has that story for us. Just pointing at him. And I didn't even know that I him. It just went off. And he was -- he lunged at me. Reporter: An admitted killer explaining why she killed. I can't mean to shoot him or anything. Reporter: A sobbing jodi arias told the jury wednesday about the day she shot and repeatedly stabbed her ex-boyfriend, travis alexander. She says, after snapping these pictures of the mormon businessman posing in the shower, she dropped the camera. He lifted me up, as he was screaming, that I was a stupid idiot. And he body-slammed me, again, on the tile. Reporter: The 32-year-old said she ran to his closet, grabbed the gun and accidentally shot alexander because she feared for her life. But the real shocker is what arias didn't say about that fateful day in june of 2008. Do you remember stabbing travis alexander? I have no memory of stabbing him. That's right. The woman who has been on the stand for eight days, recounting the minute details from a decade ago, drew a blank about stabbing herex-boyfriend. The most clear memory I have after that point is driving in the desert. Reporter: Travis alexander's family sat in disbelief. They and the jury have heard arias first tell police on this interrogation tape, she didn't do it. And now, in court, he newest story. That she killed in self-defense but doesn't remember the details. I don't know if I blacked out or what. There's a huge gap. Reporter: Perhaps if the jury finds her convincing, they will spare her the death penalty if she's convicted. But this morning, the man who believes she should die, the prosecutor, will begin his cross-examination. He argues arias is a cold-blooded murderer who keeps lying to save her skin. Expect fireworks in court. For "good morning america," ryan owens, abc news, phoenix.

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

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