a parent is held criminally responsible for a mass school shooting. her son killing four teens. it is only the first step of many things that need to change in order to protect our children. norah: the cbs evening news starts now. good evening. i m norah o donnell. thank you for being with us on this tuesday night. we want to begin tonight with a groundbreaking verdict against a michigan mother whose teenage son killed four classmates in a school shooting in 2021. the jury of six women and six men found jennifer crumbley guilty of four cons of involuntary manslaughter for allowing her troubled son access to a gun, despite warning signs of his declining mental health. this is noteworthy because it s the first time in united states that a parent has been convicted in the deaths of a mass school shooting committed by their child. prosecutors charged crumbley with four counts, one for each of the four students killed at oxford high school in michigan in 2021. well, toni