Mom and son texted about "new gun" day before Michigan school mass shooting

A day before four students were killed  at a Michigan school, the mother of the teenager charged with carrying out the mass shooting sent him a text message asking if he had showed teachers a "pic of your new gun," an investigator testified Tuesday.

The text was one of several between Jennifer and Ethan Crumbley on Nov. 29 after school officials left a voicemail informing her that the 15-year-old was looking up ammunition on his phone.

A judge must decide if there's enough evidence to send Jennifer Crumbley and her husband, James Crumbley, to trial on involuntary manslaughter charges. It's a low threshold under Michigan law, but this case is highly unusual because parents are rarely held criminally responsible for teens accused in mass school shootings.