"The prosecutors argued that Ms. Crumbley should have noticed her son’s distress and stopped him from committing an act of unspeakable violence."

"Marc Keast, one of the prosecutors, said that she and her husband 'didn’t do any number of tragically small and easy things that would have prevented all of this from happening.'...  Jurors were shown messages that Ethan sent to a friend in April 2021, complaining of insomnia, paranoia and hearing voices. The jurors were also shown messages that he sent to his mother in March 2021, in which he suggested that their home was haunted by a demon. Ms. Crumbley, prosecutors pointed out, did not always respond. But in her testimony, Ms. Crumbley said that Ethan and his parents had joked for years about whether their house was haunted, adding that her son was just 'messing around.'... 'As a parent, you spend your whole life trying to protect your child from other dangers,' [Ms. Crumbley testified]. 'You never would think you have to protect your child from harming somebody else.'..."

From "Mother of Michigan Gunman Found Guilty of Manslaughter/Jennifer Crumbley was convicted on four counts of involuntary manslaughter, one for each student her son killed in Michigan’s deadliest school shooting" (NYT).