Medical technician. Lisa dedicated her life to social work, helping and caring for sexually abused kids. Kayleen was one of lisas coworkers. She just wanted to help people. We work in a sex abuse unit and thats a very difficult subject that a lot of people cant deal with, but she really prided herself on helping these families and being able to help, you know, make a difference. Reporter everyone admired lisas selflessness. Her friend carrie ward also worked with lisa. She took in foster kids while she was a single parent and was raising her own daughter by herself. Reporter that feels sort of like going the extra mile and then some. She did. She was always there to help anybody that needed it. Reporter admirable. Yes, very much so. Reporter one year after kevin and lisa met they married. The wedding itself, i mean, was fabulous. The reception was great. Reporter did you think this marriage was going to be it for kevin . Oh, absolutely. Absolutely, there was no question in my mind. Reporter a year and a half later, lisa and kevin announced the arrival of a baby of their own, hailey. Lisa was on top of the world. Megan she loved like crazy, of course, but she really wanted another child. Reporter but lisa felt she had more to give. Two years after haileys birth, she decided to invite sixteenyearold foster child, Sabrina Zunich, into her home and to make sabrina part of the family. I met sabrina almost immediately when she came to the house. I remember her saying, i finally have a family. Everything was going really well. She fit right into the family. Lisa, i mean couldnt talk highly enough about her. Reporter but the happy times for the knoefels blended and now extended family would come to a catastrophic end on that november night back in 2012 when lisa knoefel was brutally stabbed in her home. When i heard it was lisa and who did it, i couldnt believe it. Its like, you youre kidding me. A story enough to shock any family. 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Imagine if razors could move up and down, and all around. Hugging tight, swirling left and turning right. Behold, new venus swirl. The only razor with five contour blades and a flexiball. To contour to your tricky places, bones, bends and all. Smooth and steady, going this way and that. Bumps and grooves, curvy and flat. For skin as flawless as flawless can be. New venus swirl, try it and see. Reporter the love and hope that marked the knoefels newly blended family vanished forever on a cold november night in 2012. 911, what is your emergency . Please, dont, dont reporter at about 1 00 am, the Willoughby HillsPolice Received a 911 call from the knoefel house. Youre going to kill my mom please reporter the caller was the k g knoefels 13yearold daughter, megan. She said her mother, lisa, was being brutally stabbed, right before her eyes. Stabbing my mom with a knife. Who has a knife . I have a female yelling on the phone. Somebody else has a knife. Megan was screaming, yelling at somebody to stop. Youre killing her. Stop, youre hurting her. Why are you doing this . Oh, my god. My moms going to die. Reporter in the background lisa can be heard, pleading for help. Call 911 what is going on . Oh, my god its really chilling to listen to. Youre going to have to take a deep breath. I cannot understand you. My moms going to die reporter first responding officer, randy mullenex, arrived at the knoefel home and found megan frantic at the front door. Shes waving her hands. You need to hurry. Hurry, hurry. Reporter mullenex learned Kevin Knoefel was away on business leaving lisa, megan, hailey, and their foster daughter sabrina at home. Worst Case Scenario was going through my head. What am i going to see . How bad is this going to be . Reporter it was far worse than he could have imagined. Out of the master bedroom, came the knoefels 18yearold foster daughter, sabrina, holding a knife. It looked like she literally showered in blood. Reporter mullenex ordered sabrina to the ground where she was cuffed. He then went to the bedroom where he found lisa knoefel on the floor. I could barely even see flesh color. There was that much blood on her. I knew there was nothing i could do. Reporter the coroner would later determine lisa had been stabbed and cut at least 178 times. Sabrinas weapon was a 15inch bread knife. The blade was actually bent and i just started shaking my head because i couldnt it takes a lot to bend a knife blade. Reporter with Sabrina Zunich now booked and in the lockup, detective Ron Parmertor began the investigation. Reporter this wasnt a case in which you had to wonder who was responsible . Thats correct. We knew right away it was the foster daughter. This looked like a case that could be shut as quickly as it opened, but if that were true, we wouldnt be telling you this story. This turned out to be one of the most unusual cases weve ever come across. Police would end up investigating not just who, but why with answers as stunning as they were disturbing. As dawn broke that cold november morning, detective parmertor began with his perpetrator, Sabrina Zunich. I first noticed that she was a very small girl, very frail girl. Reporter sabrina started describing the moments leading up to the murder. Shed had a migraine, she said. While everyone else slept, she walked into the knoefels master bath to get some ibuprofen. And that, she said, is where her memory went blank. You didnt think anybody could stab somebody that many times and not remember any part of it. No. I tried all different ways of, you know, get her to come out and tell me what really happened. And she was not giving it up. Reporter and then sabrina asked for an attorney, bringing parmertors interrogation to an abrupt and frustrating halt. You thought, whatever else were going to get, its not gonna come from her. Exactly. Reporter so parmertor consulted those who arguably knew this teenage ward of the state better than anyone, sabrinas social workers. She had some issues with her family growing up. Her grandma took custody of her about the age of three. Reporter case manager Nicole Corbett said sabrina struggled with having been abandoned by her parents at a very early age. She ended up in the juvenile system after stealing from her grandmother to pay for drugs and alcohol. She worked a lot, in counseling how to cope, and how to manage with everything she was going through. Reporter eventually, nicole helped place sabrina in the knoefel home. She just wanted to be a part of something, a part of a family. I know thats what she wanted more than anythi so, when she was told about being placed with the knoefels, she was ecstatic. Reporter it turned out the knoefels loving care was just what sabrina needed. She was going to class, getting good grades. I think sabrina really was thriving in their home. Reporter which made the news that it was sabrina who had brutally stabbed lisa all the more baffling. I still cant see the sabrina that i know being violent towards anyone, let alone what she did. Something else had to have been at play here. Reporter detective Ron Parmertor was thinking the same way. He wanted to talk to kevin about what that Something Else might be, but he held off. I was giving him his space because i thought that he needed time to, you know, deal with the tragic death of his wife. Reporter according to his sister, krisanne, kevin was an emotional wreck when he heard what happened. Im sure that there was some guilt because he worked nights and wasnt home. Hes like, i never thought this would happen. Reporter did you think he had anything to do with this . No. Reporter and you could definitively prove that kevin wasnt even in the house at the time . Absolutely. Kevin was on the ohio michigan border at the time. Reporter still, parmertor felt kevin might hold the key to solving the riddle of this case. Reporter why keep going . You got your suspect and shes got the weapon in her hand. I was just doing my job as a detective. I was trying to find out why. Reporter it was the one central question that continued to plague detective parmertor and drive him forward. Youre crossing your fingers and thinking we really need a break. Yes. Reporter and then one day it arrives. One day sabrina decides that she wants to tell us what happened. Reporter and the story sabrina ultimately told was far more complicated and twisted than anyone could have imagined. Coming up stories in the seemingly happy home triggered by sabrinas odd behavior. She wasnt happy, no. Sabrina says she wasnt the cause of the problems in the house but the victim. It really hurt me. Reporter news of lisa knoefels bloody murder cut through Willoughby Hills, ohio, like a blistering winter wind. I was shocked. Lisa was a nice person. She was a good mom. She was a good wife. For someone of that much beauty and that much giving of herself to just be taken from us like that. Its just its too much. Reporter finding out that the foster daughter lisa welcomed into her home ended up committing lisas murder only added to the collective pain and suffering. Betrayal is the perfect word for what happened. I mean, somebody hurting her that she had taken in. I just cant even imagine what she must have been going through. As detective Ron Parmertor worked the case, he learned thered been growing tension within the knoefel home, right before the murder. And the source of that tension was sabrina. She got along great with kevin. And she did not get along well at all with lisa. Reporter parmertor discovered lisa had become frustrated with sabrinas behavior toward kevin. She was fascinated with kevin. She seemed a little vivacious in my eyes. Flirty, like flaunting herself. Reporter and parmertor learned from texts on lisas cellphone that sabrinas flirty behavior had begun to take its toll on lisa and kevins marriage. Sabrina was demanding kevins time and kevin was making himself available too available, as far as lisa was concerned. You have one actual text from lisa to kevin in which shes saying, youre getting too close to sabrina . Yes. Reporter in fact, lisa wrote cut the damn cord. Spending too much time with her and less with your real family. Thanks a lot. Lisa also became concerned about the relationship sabrina had with her daughter, hailey. She acted like a mother to hailey on a regular basis. It made lisa uncomfortable . Lisa wasnt happy with it, no. It sounds like one of the things everyone agrees on is that sabrina was fixated on, fascinated with hailey. She was. I think she was infatuated with the whole family. And she wanted to be biologically in that family. Reporter parmertor learned that just weeks before the murder, tension between lisa and sabrina had reached the breaking point. After seveenteen months under the knoefel roof, sabrina was told it was time to pack up and get out. Sabrina got very upset and knew that lisa was the one initiating that action. And what, snapped . Yes. Reporter but right now, all that was just a theory. Then, six months after the murder, the investigation took another turn. Parmertor learned sabrina was ready to talk. She starts telling her story. She starts sobbing. Tears are coming down her face. Sabrina told dateline the same story she told police, the story of a young girl bouncing through the foster care system, always dreaming of a better life. I wanted a new beginning and to put all the past behind me. I wanted that picket white fence, the dinner around the table with siblings, and you know, something i never had. I wanted that structure of a family. Reporter so, when the knoefels opened their door to sabrina, it was a dream come true. My First Impression of kevin was a caring father. Somebody that was willing to, you know, get to know me and want to know me. Reporter and then there was lisa. My relationship with lisa, it was, at first, good. We would all spend time together. We would go swimming in the backyard. I felt a part of the family. Reporter then, sabrina confirmed what parmertor had already heard the good times quickly came to an end when sabrina and lisa started arguing. According to sabrina, lisa began thinking of her as more foster than daughter and sabrina didnt like that. I felt like the outsider. I felt kind of abandoned, in a certain type of way, and not accepted. Reporter sabrina admitted her close relationship with both kevin and hailey had become a major source of friction with lisa. She doesnt like the fact of how im acting with hailey and wouldnt let hailey come around me, not even give me a hug at night. It really, it hurt me. Reporter and then came the moment when sabrina said lisa told her it was time to go. She was very blunt about it. And she was like, im sorry, but i dont want you here anymore. My life was shattering before me. Reporter the betrayal, the abandonment. All that came to surface. Two weeks later, sabrina says she quietly, carefully walked into lisas darkened bedroom, a knife in her hand. I was in the room for a good 10, 15 minutes. It was a constant, like, battle in my head. Just do it. Dont do it. Just do it. Reporter in the end, it was sabrinas darker side that won out. She wakes up and she thought i was megan and was like, megan, go to bed. I completely froze. And then she sits up in her bed and she was like, megan, go and she realized it wasnt megan. And thats when i did it. I remember her shouting, and i remember megan coming in and setting a hand on my shoulder and saying stop. And i just nudged her off and told her, megan, dont. Reporter anger, triggered by a troubled teenagers feeling of abandonment, leading to murder. For Ron Parmertor, sabrinas story made perfect, if tragic sense. You believe sabrina . Absolutely. Reporter but sabrina was not done. What she was about to reveal would send this investigation hurtling in a completely new and alarming direction. Sabrina told detective parmertor she didnt act alone. I couldnt have done Something Like this if i didnt have an outer influence. Coming up sabrina drop a bombshell claiming that getting rid of lisa was actually someone elses idea communicated in a series of bitter texts. I wish she was dead or i cant stand her. She needs to go. Thanks for the ride around norfolk and i just wanted to say geico is proud to have served the military for over 75 years roger that. Captains waiting to give you a tour of the wisconsin now. Couldve parked a little bit closer. Its gonna be dark by the time i get there. Geico. Proudly serving the military for over 75 years. 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Absolutely. I hated lisa. But it was only because she was triggering a lot of past issues. Reporter but there was more. There was, said sabrina, someone else. Its not all my fault. Now i take responsibility because i did what i did. And i know it was wrong. But if it werent for him it would have never happened. If it werent for him. Reporter sabrina was referring to her foster father kevin. I was doing what ke