Next week will be six months since 43 students from a rural teaching school disappeared in Southwest Mexico.
The government of Mexico says the students are dead.
But family members believe the government is misleading them. That's why some came to Texas hoping to keep their case alive.
It was a typical morning last September when Maria de Jesus Tlatempa said good-bye to her 18-year-old son Jose Eduardo Vartola Tlatempa.
Speaking in her native Spanish, Tlatempa says her son "was really proud that he was a student. He was going to become a teacher, and he was really proud of that."
She didn't know it then, but that would've been their last day together.
Jose Eduardo Vartola Tlatempa was with the group of students who were protesting the conditions of rural schools in Mexico. They were also fundraising to travel to Mexico City for the annual pilgrimage of students from all over the country to mark a mass student killing that took place there in 1968.
Omar Garcia Velazquez is also a student. He was there with Tlatempa’s son on the night he disappeared.
Garcia Velazquez also speaks in Spanish. He says he remembers how police chased them down. Then, they were ambushed.
"The police shot at the buses full of students," Garcia Velazquez says. "[They brought] the students down and beat them up before loading them into trucks."
The official version is that police released the students to a band of drug dealers. Garcia Velazquez says he escaped because it was the middle of the night and police didn't have room in the patrol vehicles for all of the students; the darkness worked in his favor.
By some accounts, the students were tortured and burned.
But, Maria de Jesus Tlatempa believes her son is alive.
This week, she and Garcia Velazquez are in Texas rallying support. They want the U.S. and other countries to pressure Mexico to re-open the investigation into the disappearance and find the truth.