We'll start with a young woman at the center of a brutal murder case. The alleged victim her own mother. They tried to intervene in the hours before the killing. What went wrong? We have a gruesome... See More
We'll start with a young woman at the center of a brutal murder case. The alleged victim her own mother. They tried to intervene in the hours before the killing. What went wrong? We have a gruesome story. Reporter: It's chilling. Before the murder, police were at teenager's house with a stern warning to her to respect her mother or be thrown out of the house. Hours later, police were back, this time to a bloody murder scene. District 1 is looking for isabella guzman, cut her mother's throat. Reporter: Police say this is the face of a killer, and the alleged victim is her own mother. The 47-year-old's body the center of a bloody crime scene in the aurora, colorado home. She stabbed her 79 times. She's on foot. Reporter: After an all-night search, they discovered her in a nearby parking lot. In a police report, the father heard her, and allegedly found the stepdaughter standing other her body. Her biological father says he spoke with his daughter earlier that day. The topic of conversation, her troubled with relationship with her mother. I still can't believe it. I thought that I made progress. Obviously I didn't do anything. Because it was later that this thing happened. Reporter: Prosecutors say in the days leading up to the murder, guzman yelled at her and submit at her, and sent a clear message via e-mail, you will pay. A teenager that looks more like a model than a murder suspect behind bars. She's held without bail on first degree murder. The next court appearance is SEPTEMBER 15th. An incredibly disturbing story. Indeed. Thank you. We're going to ron claiborne with the other top story
This transcript has been automatically generated and may not be 100% accurate.