Knorr was physically, verbally, and psychologically abusive toward her children. After her fourth divorce, her alcoholism and abusive behavior escalated, and she also gained a tremendous amount of weight and became quick-tempered and reclusive. She disconnected the home phone and would not allow the children to have visitors. Knorr and her children lived in Orangevale, California for many years before moving into a two-bedroom apartment in Sacramento; Knorr's eldest son Howard reportedly left home before the move to Sacramento. According to neighbors, the apartment was filthy and smelled of urine. Neighbors also noticed that the children, whom Knorr never let go outside, seemed fearful, nervous and high-strung.