Half of all Texas school districts have no mental health services. Uvalde was one of them.

After eight students and two teachers were murdered in 2018 at Santa Fe High School in Santa Fe, Texas, Governor Greg Abbott vowed to find solutions for the lack of mental health resources in schools.

"We need to do more than just pray for the victims and their families," said the Texas governor.

Four years later and on the heels of another deadly Texas school shooting, a CBS News investigation found most of the state's public schools still offer little to no direct access to mental health services for their students.

"No one listened to us, students," said Zach Muehe, who four years ago ran out of his sophomore art class at Santa Fe High School when a gunman opened fire. "The mental health problem, I believe, is the root of it all. It is just never talked about and I don't know why."

Survivors of school shootings said they've tried sounding the alarm about the lack of student mental health services for years, but often felt their concerns were ignored.

In Texas, 593 school districts have no school psychologist on staff and do not offer a telehealth option, according to CBS News' analysis of data from the Texas Education Agency (TEA). This leaves more than half a million Texas kids without any mental health services in school.