Transcript for Prosecution claims woman killed mom for trying to stop her party lifestyle: Part 3
Reporter: The Shelby county justice center in downtown Memphis is about to become a coliseum for two legal gladiators. In noura Jackson's corner, a pitbull of a defense attorney named Valerie corder, who loves a legal dogfight almost as much as she loves her dog, Beasley. Why would you take this case on, pro Bono? I have a soft spot for people who are being bullied or treated unjustly or unfairly. Reporter: Across the aisle, prosecutor Amy wierich, an ambitious, no-holds-barred assistant D.A. Amy is a real no-nonsense type. Very intense throughout. Reporter: As the trial starts, wierich comes out swinging for the electrified fences. She wants a life sentence. That defendant killed her mother with premeditation. Reporter: Wierich calls many of the kids in noura's circle to the stand. A phalanx of her now-former friends lines up to portray her as a girl gone wild. On the stand today we heard from more of noura Jackson's friends. She liked to use xanax bars. Pharmaceutical drugs. Cocaine. Reporter: How much did that hurt her case? Significantly. Reporter: Noura's friends admitted to doing much of the same alongside her. Most of the stuff they said was true. I mean, she was doing that. But so were they. If the behavior that she exhibited was grounds for mother murder, then why aren't all those other children's mothers dead? They were right along with her. Reporter: Aside from soiling noura's reputation, the prosecution raises suspicions about her behavior on the night of the crime. This is the neighbor noura ran to for help after finding her mother's body. He grabbed his gun and ran back with noura. And I got to that front door first and I took a deep breath. I do remember that she went in the door before me. And I thought, "There's somebody in that house." If you thought somebody was in the house and you thought your mother was injured, why would you have run back in before the guy with the gun. A lot was made of my actions, you know, of what I did or didn't do or, you know, but I don't think they write a handbook on stuff like that. If my mother had been murdered, I'd be running all over the place without realizing what I was doing. Reporter: And anyway, why would noura murder her own mom? To answer that, the prosecution paints a picture of a relationship in crisis. Jennifer Jackson, they claim, was finally trying to rein in her untamed daughter. She was just out of control. Reporter: Judge Chris craft presided over the case. She was shutting down her lifestyle and was going to send her somewhere where she wouldn't be able to have sex and drugs. And that was the motive for the killing. There was a portrayal of her as not only friction in, in their relationship, but much more than that. Much more violent, much more antagonistic. Reporter: That is the theme of this damning testimony from onetime friend Kirby McDonald. Noura said, "My mom's a And needs to go to hell." You know what, my mother was a bitch sometimes too and sometimes I wanted her to go to hell. I don't know if noura said that or didn't say that, but so what if she did? They're teenage girls, for heaven's sake. Reporter: Noura says it never happened. Did you argue about partying and curfews? I didn't, I didn't have a curfew. We had things that we didn't agree on, but there was a respect there. I didn't hide things from my mom. Reporter: Another suggested motive -- money. Prosecutors claim noura's deceased father left behind a sizable estate. The defense denies that, but neighbor Sheila Cocke says noura was salivating for cash. I was out on the street walking my dog and they were coming in and I heard noura say, "Just give me the effing money. Just give me the effing money." Reporter: And it's not just friends and neighbors pointing the finger. Now, remarkably, noura's own family has come to court, not to praise her, but to bury her. Here's noura's uncle Eric Sherwood. I asked noura if she had any idea about my sister's death, anything to help out with the detectives, and she just basically just put her head down and wouldn't say anything. That was it. Reporter: He also tells the court that he had heard noura pressing Jennifer about her assets and life insurance just days before she was murdered. Your own uncle testified that you killed your mother because you wanted the money. That's the one that hurt me. That's the one that pierced my heart. Reporter: Noura's aunts also pile on, hoping to send their own niece to prison. They wouldn't talk to each other, and just, it was very cold. What shocked me was what they didn't say, you know. They didn't say that, you know, they -- they never really cared for me. They didn't say that they never liked my father. It's never helpful when your family isn't on your side in a case where someone is accused of killing a family member. Reporter: Noura's aunts say the real reason they turned on her is because she could never explain where she was at the time of the crime. I would have gotten her lawyers, anything she needed if she had an alibi and could prove to me where she was or who she was with when my sister was murdered. And she said I don't know. Reporter: And now the prosecution's key witness, her quiet, reserved friend Andrew Hammack, who they hope will blow noura's alibi out of the water. Andrew Hammack describes their relationship at the time as friends with benefits. Reporter: He tells the jury he exchanged calls and texts with noura around the time of the murder. He says she told him she was at the house, and asked him to meet her there. She also left a string of messages. It was throughout the night and the last thing I do remember when I woke up the morning of June 5th is I had a text message or a voicemail that said "Answer," "I need to talk to you" or something. Reporter: And what about that suspicious cut? The biggest problem for her in this case are her own words. Her own differing accounts of how she cut her hand. Reporter: Let's count. She claimed that she cut it at an Italian festival. She told me that she was in her house, chasing her kitten through the kitchen and cut it on some glass. She said that she cut it on barbed wire. She said she cut it getting the cat out of the garage. I burned it cooking macaroni and cheese. I cooked a lot of Kraft Mac and cheese and I've never gashed my hand open and raced to walgreen for band-aids. Reporter: All these people testified that there were different stories you gave about how you got that cut in your hand. I mean, I gave my statement to the police and I will allow that to speak for itself. Reporter: That statement matches the first version. That she cut it at the Italian festival. But then why, prosecutors ask, was there a cover-up, literally, despite the steamy 90-degree heat. For days afterward wearing nothing but long sleeves that she held in her wrists like this to try to cover up that cut. I mean, what more do I have to tell you? Yes. I wore long sleeves. I was known for that. My father's Lebanese. I have very, very hairy arms. I used to shave them when I was younger. Reporter: The battery of witnesses, the wafer-thin alibi, the questionable cut -- none of it looks good for noura. But, wait. Will DNA found at the scene get her off the hook? Not only was noura's DNA not found in the room, but someone else's was.
This transcript has been automatically generated and may not be 100% accurate.