On January 7, 1978, in
Rockford, Illinois, after his wife called him to say she wanted a divorce, Nelson used a knife and rubber mallet to kill his children, 12-year-old Jenny, 10-year-old Simon Peter III, 8-year-old Andrew, 7-year-old Matthew, 6-year-old Roseann, and 3-year-old David, while they were asleep. He also slit the throat of the family dog, Pretzel. Pretzel was found lying between two of the children. Nelson then drove to
Milwaukee and attacked his wife. As he was beating her, he told her that he had killed the children. Police arrested Nelson midway through the attack. Nelson's defense team pleaded
not guilty by reason of insanity. He said he could not recall the killings, claiming he snapped when his wife called to say she didn't love him anymore and was divorcing him. Nelson's defense failed, and he was convicted of six counts of murder. The prosecution sought the death penalty, which had been reinstated in Illinois less than six months prior to the murders. Asking for mercy, Nelson's
public defender said, "You have to remember that the decision you make today is one you will have to live with for the rest of your life. If electrocuting Simon Peter Nelson will bring back the children, then do it. Or will it be more cruel to make Nelson think about every second, every minute, every hour, every day, every month, and every year for the rest of his life what he did? Yesterday I wouldn't ask for mercy. Today I do." The jury had voted 11–1 in favor of a death sentence, but the decision needed to be unanimous for a death sentence to be imposed. As such, Nelson was sentenced to six concurrent prison terms of 100 to 200 years, and officials recommended that he never be released from prison. At his sentencing hearing, Nelson apologized:"Words cannot express my deep sorrow and humble apology for the loss– the pain–the fear my actions have caused our community. Of the many concerns over the tragedy to my children and family, one is that child not be fearful of his parents [and that] the parents pause and reflect on their responsibility as adults to love and not abuse God's children, either in word or deed." ==Parole hearings==