She first told investigators that an intruder had broken into the home and murdered the children. Her story then shifted to tales of voices from the devil commanding her to perform the act. Later, she said that the children were poisoned by society and didn't listen to her as they should. Eventually, however, Elzbieta M. Plackowska admitted that she murdered her 7-year-old son, and his 5-year-old friend, because she was mad at her husband, reports the Chicago Tribune.
She told the children to go to bed. Instead, Justin and Olivia began jumping on the bed in the master bedroom. According to prosecutors, Plackowska went to the kitchen, found a knife, entered the bedroom, and then told the children to pray. She told Justin that he was going to heaven before cutting his throat and stabbing him 100 times. She then stabbed Olivia about 50 times because she was a witness. Two dogs were also stabbed to death in the rampage.