Investigators say Pagourtzis has admitted going on a shooting rampage at Santa Fe High School that killed eight students and two teachers. Authorities say the teen used his father’s pistol and shotgun, and described planning the attack in private journals.
It was the nation’s deadliest such attack since the mass shooting at a Florida high school that gave rise to a campaign by teenagers for gun control.
After the shooting, Texas Gov. Greg Abbott called for schools to have more armed personnel, though he faced pushback after suggesting tightening of some gun laws.