criminal charges connected to that deadly school shooting this week in oxford, michigan. their 15-year-old son is accused of using a pistol purchased just a week ago as an early christmas present to kill four students and injure seven other people, including a teacher. two students are still in the hospital. a prosecutor today charged jennifer and james crumbley with involuntary manslaughter for allegedly failing to prevent the attack by not meeting their responsibilities as gun owners. the university of michigan will honor the victims this weekend. the wolverines football team will we're a tribute patch at their big ten championship game tomorrow. it includes an "o" for oxford, and the initialed t.m., tate myre, a varsity football player who was killed. there's a lot to get to, and cbs' nancy chen is in pontac to lead off our coverage. good evening, nancy. >> reporter: margaret, good evening to you. an attorney for jennifer and james crumbley says they are not missing but simply left town after tuesday's shooting and