Transcript for Jackson Wrongful Death Trial: Testimony Over
Now, to michael jackson's wrongful death lawsuit. Closing arguments finally starting today after more than five months. Jackson's family trying to convince a jury that a concert promoter was responsible for the pop star's death four years ago from a drug overdose. Here's abc's david wright. Reporter: In the world of big money trials over big-name celebrities, it doesn't get any bigger than this. I'm confident this jury is going to do the right thing. Reporter: After hearing from more than 50 witnesses in a marathon 84 days in court, the michael jackson trial comes down to the jury today. It's been five months. They've heard a lot of stuff. And now, they have to apply it to the law. Reporter: The crucial question before them, number one, in the newly-finalized jury instructions, did concert promoter aeg live hire dr. Conrad murray? We, the jury find the defendant conrad robert murray, guilty. Reporter: A different jury, you'll remember found murray guilty of involuntary manslaughter. The question before this jury is, was he working for michael jackson? Or for aeg when he prescribed that fatal dose of propofol? The facts show he was never hired by aeg. He was hired by michael jackson three years prior. Reporter: But the jackson family insists aeg paid murray's bill and put murray under huge pressure to get jackson ready for the multimillion-dollar comeback tour they were promoting. ♪ days before the four was about to begin, jackson suddenly dropped dead. The worst day of my life. I never want to feel like that again. Reporter: Katherine jackson, michael's mother, is one of the plaintiffs. Along with prince, michael and paris. In the midst of this trial, reliving it all became too much for paris. She had to be hushed to the hospital by ambulance at 2:00 in the morning. Attorney general mark geragos says if the jacksons win, the damages could run into the billions of dollars. The sum meant to reflect what michael jackson could have earned had he survived. Michael's kids will be in college or in grad school by the time they ever see any of the money. Reporter: Whatever the jury decides, the verdict will almost certainly be appealed. For "good morning america," david wright, abc news, los angeles. We're going to bring in abc news chief legal affairs anchor, dan abrams right now. The family we heard, such emotional testimony the last months. Will that have any kind of impact? They are the plaintiffs. It is very emotional. They're being called for legal reasons. As a legal matter, each of their testimony isn't that significant. The important legal questions here, is who hired dr. Conrad murray? Who controlled dr. Conrad murray? Was what happened here foreseeable? Those are questions that the family can't answer, in terms of what they directly know, rather than the people involved in from aeg, et cetera. What are their chances in the lawsuit? The biggest problem for aeg is that the case got to a jury. A judge threw out almost all of the claims against aeg, except for one. And that was the negligent hiring of dr. Murray. That's the claim this jury is deciding here. The danger aeg has is that the jury is allowed to apportion blame. They could say, yes, we think aeg was negligent. But only for 20%. Let's say. But when you're talking about the kinds of dollars we're talking about here, you're still talking about the potential for huge money. So, even a small loss, legally in connection with this case, could be a big loss in terms of dollars for aeg. Five months. This has gone on for five months. Is that playing to either side's advantage? I think it helps a little bit the plaintiffs, the jackson family. The jury may say after all this time, we're not going to give them anything. I think it's been way too long. A simple legal question. They're nearing the end now. Dan, thanks so much. Back over to sam.
This transcript has been automatically generated and may not be 100% accurate.