Victim's Girlfriend Testifies in Coffee-Poisoning Case

Oncologist allegedly poisoned her coworker after he decided to stay with his girlfriend instead of her.
3:45 | 09/24/14

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Transcript for Victim's Girlfriend Testifies in Coffee-Poisoning Case
Now the latest on the sensational poisoning trial in Texas. A prominent cancer researcher accused of almost killing her lover by spiking his coffee. The other woman was on the stand Tuesday. Ryan Owens has the story. I've been progressively discoordinated. Reporter: You're watching cell phone video of Dr. George Blumenschein in a hospital waiting room as the poison in his body starts to take its toll. Just offscreen, the woman on trial accused of psoning him, Dr. Anna Gonzalez. The video was shot in January of 2013 by his girlfriend of more than a decade, Yvette Tony. I actually thought he's dying in front of me. Reporter: Tony spent much of Tuesday on the stand, testifying about how she found out her Po boyfriend was having an affair with Dr. Gonzalez. I felt stupid. It was three weeks, I felt like an idiot. Reporter: Prosecutors say she spike the coffee with a sweet-tasting poison found in anti-freeze and claimed it was splenda, all because he chose to stay with his girlfriend and not her. She had a special Colombian coffee. Reporter: He has permanent kidney damage, and Dr. Gonzalez is charged with aggravated assault. She's pleaded not guilty. But if convicted, the world-renowned cancer doc may spend the rest of her life in prison. Are you still with Dr. George Blumenschein? Yes. I'll ask what everyone wants to know, why? Because I know the affair with the defendant is not the sum of who he really is. Reporter: Ryan Owens, ABC news, Houston. And Dan Abrams is back with more on this. So the jury seeing the video of the possible effects of the poison. Yeah, very powerful stuff. When you're watching that video, seeing it literally coursing through his veins. The question becomes, of course, how does it relate to the issue of guilty or innocence? Look, the most important question in this case, in addition to the medical evidence, is do you believe the doc? Because if you believe his account, she says I have a special Colombian coffee to try. He tries it, immediately says, wow. This tastes incredibly sweet. She says I put in splenda, et cetera. Very shortly thereafter he's in the hospital. They say he's poisoned. Wow. If you believe all of that, it's very hard to think of how the defense is going to be able to overcome that. They're saying medical evidence. He could have been poisoned at all sorts of different times. But that whole try my special Colombian brew followed by this tastes really sweet isn't helpful to the defendant. Do you think the defendant will testify? I think probably not. In addition to the fact the defendants rarely testify in a case like this, in this case, you have six hours of audiotape. 14 different calls reported between him and her, she's denying it. She's saying, hey, move on with your life. Et cetera. I don't know why I would do this, check with your girlfriend. So I think that allows the defense to say we have put on our case in effect through these audiotapes. Don't need to testify. This has been an odd one. And it's a tough case for the defendant. It is. Thank you.

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

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