lisa kinnvall was brutally murdered in her home.stabbed nearly 200 times when cops arrived at the scene. her 18 year old foster daughter, sabrina zunich, was holding a bloody knife. sabrina says her foster father coached her to kill so they could be together. now, the sister who witnessed the horror speaks out to true crime news in the overnight hours in this willoughby hills, ohio home, social worker lisa kinnvall is sleeping in her bedroom. her husband kevin, is away at work when suddenly violent screams wake their teen daughter, megan. >> 9-1 1-1. what is your emergency? please >> 17 year old foster daughter sabrina zunich is on top of lisa in a violent rage, stabbing the woman who gave her a new home. what is going on? >> oh my god, what is going on? it was. >> oh, what is going on? hello >> my mom was a knife responding officers arrived to find sabrina covered in blood. >> she came out of the bedroom where she had both hands raised in the air, and she had a very large bread knife in her right hand. >> the loving foster mother s