Dimitrios Pagourtzis, a student at the school, faces charges of capital murder and aggravated assault of a public servant. "This kid should never have been able to get his father's shotgun and being underage", said Texas Rep. Rafael Anchia.
The Galveston County sheriff said administrators and officers at Santa Fe High School did all they could to stop a teenage gunman.
"I still think he's very confused about the incident".
Officers arrived at the school's art lab section about four minutes into the shooting and engaged the shooter right away, Galveston County Sheriff Henry Trochesset told CNN.
Ten white crosses were placed at a memorial outside Santa Fe High School while a 10-second moment of silence was observed across the state Monday morning to remember the victims.
The Latest on a high school shooting in Texas. Her body was to be returned to Karachi.
The community is still processing "the shock and sadness on the killing of the Pakistani exchange student", said Afshan Jilani, a Pakistan-born human resource professional who attended Sabika's funeral.
New details have emerged about the heroic effort to confront a young man who opened fire at a school Friday, which prevented a larger tragedy.
But Daniel Webster, the director of the Johns Hopkins Center for Gun Policy and Research, said he was not aware of any systematic study of the matter.
"It is so much bigger than us", Waters said, "This is something that if we can start it here, then this can spread out into the community, spread out into even the nation".
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.
All schools in Santa Fe will be closed today and tomorrow, officials said. She said she hoped to see them cover a number of proposals, including potential changes to the state's child access prevention law.
Chris Turner, of Grand Prairie, who is chairman of the House Democratic Caucus, said he welcomed a discussion with state leaders, but added that Texas should go further by passing universal background checks, requiring the reporting of stolen guns and beginning a "safe gun storage campaign".
Poehl said that there was no history of mental health issues with his client, though there may be "some indications of family history".