Texas State Representative Jeff Leach said Crusius lived in Allen and graduated from Plano Senior High in 2017.
Collin College also said in a statement that Crusius attended from fall 2017 to spring 2019.
“Collin College is prepared to cooperate fully with state and federal authorities in their investigation of this senseless tragedy. We join the governor and all Texans in expressing our heartfelt concern for the victims of the shooting and their loved ones,” the statement said.
Crusius just turned 21 this week, before opening fire near Cielo Vista Mall — killing at least 20 people.
Officials said 26 people have been injured, including a four-month-old child.
University Medical Center of El Paso spokesman, Ryan Mielke, said two children, ages 2 and 9, were transferred to the El Paso Children’s Hospital.
El Paso Police Chief Greg Allen said the shooting “has a nexus to a hate crime.”
Officials said Crusius surrendered at the scene to approaching officers.
Authorities believe the 21-year-old posted a manifesto on the online forum 8chan, which listed “the Hispanic invasion of Texas” as one of the motivations for the attack.
More than a dozen members of law enforcement have since been seen outside an Allen home associated with Crusius, including agents from the FBI, Texas Department of Public Safety and federal Bureau of Alcohol, Tobacco, Firearms and Explosives.