Woman Allegedly Mowed Down Husband, Blames Xanax

Brenda White says she took too much of the anti-anxiety drug before entering vehicle.
3:00 | 08/10/12

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Transcript for Woman Allegedly Mowed Down Husband, Blames Xanax
Back with that bizarre case, now, out of utah, where a woman is charged with trying to murder her estranged husband, by running him down with her car. Here's the twist. Brenda white's defense is that she took too much of the popular drug, xanax. Neal karlinsky joins us now. Good morning, neal. Reporter: George, good morning. Is he is a cold-blooded attacker? Or a victim, overcome by stress and incapacitated by anti-anxiety drugs? That's the question the jury will try to answer in this very unusual case. It was a dramatic and very public attack. All captured on surveillance video. 911 emergency. Hi. This suv just drove into our building. He's chasing some guy down. The car's all the way inside the building. He went through, going like 70 miles per hour. Reporter: Running for his life is jon white. Dodging his estranged wife, 30-year-old brenda white, behind the wheel. A guy came running by with an suv behind him. Reporter: When it was over, white's legs were broken. Had anybody come off those elevators or around the corner, they would have been an innocent victim in this. Reporter: In a utah courtroom this week, brenda white's attorneys argue she was suffering extreme emotional success. She says she was suffering from panic attacks over problems with her husband and lost control when she took too much xanax, an anti-anxiety drug. It's a strategy they won't discuss in trial. But spoke about in 2007. If the jury were to hear all those factors, I think they could empathize with her situation. Reporter: The case gets even stranger. Before the car attack, jon white said brenda came to his oe at lunch, and played the song "angry johnny" by poe. Which includes the lyrics, "i want to kill you, I want to blow you away." When that came up, she would mimic a gun and point it at his head. Reporter: Anger, outbursts, delusions. But those symptoms are extremely rare. Whether it's xanax, alcohol, or other prescription medication, these really aren't complete defenses. It's used to try to reduce the charge, not to get away with the crime. Reporter: No cameras are allowed in court. But brenda did take the stand in her own defense yesterday and said she didn't remember a thing. Quote, it was not me, she says, about her behavior behind the wheel. This case could go to the jury later today. George? Look out below. Josh with the high-wire "play of the day."

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

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