A teenager pleaded guilty Monday to terrorism and first-degree murder in a Michigan school shooting

source:AJANSEV

that killed four students and put an extraordinary focus on the boy's home life and the alleged role of his parents in the tragedy.

source:social media

Ethan Crumbley, 16, pleaded guilty to all 24 charges, nearly a year after the attack at Oxford High School in southeastern Michigan.

source:mlive

In the gallery, some relatives of the victims wept as assistant prosecutor Marc Keast described the crimes.

source:social media

"Yes," Crumbley replied, looking down and nodding in affirmation, when asked if he "knowingly, willfully and deliberately" chose to shoot other students.

source:mlive

The prosecutor's office said no deals were made ahead of Monday's plea. A first-degree murder conviction typically brings an automatic life prison sentence in Michigan

source:mlive

The teenager withdrew his intent to pursue an insanity defense, and repeatedly acknowledged under questioning by Oakland County Circuit

Court Judge Kwame Rowe that he understands the potential penalties. Sponsor Message

A teacher had discovered a drawing with a gun pointing at the words: "The thoughts won't stop. Help me." There was an image of a bullet with the message: "Blood everywhere."

source:mlive