Sadie Rodriguez, the mother of Santa Fe student Shana Fisher who was killed in the attack, has said in media accounts that her 16-year-old daughter had rejected four months of aggressive advances from Pagourtzis.
On Wednesday, district teachers and support staff will return to school, the district said. He said the nature of the probe remains unclear, because kids have not been interviewed on this matter.
Galveston County Sheriff Henry Trochesset told CBS News that students were not hit by friendly fire.
"We can have moments of silence all day and all night, but unless we are willing to do something, get to the root of the problem, then we will continue to see this happen over and over again", said a Social Studies teacher at Northside High School.
Republican Sen. Ted Cruz, who has been a staunchly pro-gun throughout his political career, added his own sentiments, though he didn't suggest that gun restrictions might help: "There've been too damn many of these".
Numerous aspects of the attack mirrored another American school shooting: The massacre at Columbine High School in Colorado in April 1999, when two teenage boys with weapons hidden under trench coats killed 12 students and one teacher.
"Maybe people grew up in a house with hunting guns and other guns available, but they need to realize that we're living in a different time", he said.
In an online statement, the school district said it investigated the accusations and "confirmed that these reports were untrue".
Another school banned backpacks to prevent hidden weapons from slipping through, while others changed dress codes to forbid heavy clothing such as the trench coat Pagourtzis was said to be wearing to hide his weapons.
Houston Mayor Sylvester Turner said Sheikh continues to be a diplomat "because even in her death, she is pulling the relationships between Pakistan and the United States, specifically the Houston area, even closer".
Poehl said that there was no history of mental health issues with his client, though there may be "some indications of family history".
"It would be everything from school design to metal detectors to background checks and making sure people lock up their guns away from their ammo".
At one school, a student brought an unloaded gun to campus, while at another, a student brought a gun - apparently - to harm himself, local media reported.
So what else can be done to protect students?
All three students were arrested.
Eight students and two teachers were killed.
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