happening, to have done it. >> reporter: james and jennifer crumbley each charged with four counts of involuntary manslaughter following tuesday's attack. >> we have an active shooter incident. so far we have confirmed injuries. >> reporter: the oakland county prosecutor saying the father bought the semiautomatic handgun, used in the shooting, four days earlier with his 15-year-old son ethan by his side. ethan later posting a picture of it on social media with the caption, just got my new beauty today. and his mother in her own now-deleted post writing, mom and son day testing out his new christmas present, according to prosecutors. within days, ethan the behavior sets off alarm bells at oxford high school. prosecutors laying out a series of glaring failures that followed. >> a teacher at the oxford high school observed ethan crumbley searching ammunition on his cell phone during class and reported the same to school officials. >> reporter: jennifer crumbley doesn't respond to messages from