The prosecution just revealed new information about Ethan Crumbley, 15.
Crumbley was arrested for killing four of his classmates at Oxford High School on November 30.
The prosecution laid out a timeline of what happened in the six months leading up to the shooting.
The family dog died and his “only friend” moved away at the end of October.
He reportedly sent his mother “disturbing texts about his state of mind.”
“Instead of paying attention to their son and getting him help, they bought him a gun,” the prosecution wrote.
The prosecution also alleges that his parents knew that Ethan tortured animals.
He kept a baby bird’s head in a jar on his bedroom floor, which he brought to school with him one day.
His mother was also having an affair and told “her boyfriend” that the gun was in her car on the day of the shooting.