Four people were hurt in the shooting including two teachers and two students. One 15-year-old boy was critically injured, another student was grazed by a bullet, and a teacher was shot.
Arlington police said officers found other weapons in the family’s home and believe they found the .45 caliber gun Simpkins used during the shooting on campus.
The Simpkin family say that there has been a history of their son being bullied and that he was trying to protecting himself.
He was fitted with an electronic leg monitor.
He was released after paying a $75,000 bond.
As part of his bond conditions, cannot possess a firearm and cannot have contact with any of the victims.