Webjames crumbley, the father of the teenager who killed four students at a michigan high school in 2021, was found guilty thursday of involuntary manslaughter in a trial that comes a month. The crumbleys were found guilty of involuntary manslaughter in. Webjames and jennifer crumbley, the parents of the teenager who killed four students in the 2021 school shooting in oxford, michigan, were each sentenced to 10 to 15 years in prison on tuesday,.