murder and terrorism charges. prosecutors leaning on his social media post, showing off his gun. video of him at a shooting range, journal entries about torturing baby birds and a video of crumbley describing his desire to kill. i understand my consequences. i understand that people put me in prison for this. reporter: crumbley was 15 at the time of the shooting. these proceedings are known as a miller hearing. they re required since the supreme court case struck down mandatory life sentences without parole for minors. defense attorneys argue he can be rehabilitated, that he came from a violent home and wrote about wanting help controlling his anger. the fact that a vile offense occurred is not by itself enough to warrant the imposition of life without parole. reporter: a judge declining to let crumbley s parents attend the hearing, each facing charges of involuntary manslaughter for investigators say giving their son a gun for christmas, despite signs he may be violent. jennif