University of Texas Austin Shooting?

There was a shooting at AT. A gunman wearing a ski mask and brandishing a rifle has shot and killed himself in the library of the University of Texas in Austin.
The shooter was found dead on the sixth floor of the library from apparently self inflicted wounds.
The University of Texas was on lockdown after the shooting.
Was the shooter a student at the University of Texas? Why did he do it?

The gunman fired "several shots" inside a library at the University of Texas and then shot himself. The identities of the shooter or suspects nor their motives were immediately known.
No one else was injured but police were said to be scouring the campus for a possible second suspect.

An email and text alert was sent to students and faculty around 8 a.m. Central Time, just as the day's first classes were beginning, warning that an "armed subject was reported last seen at Perry Castaneda Library" and telling students to remain in place.
The university was closed at mid-morning and all classes for the day were canceled as law enforcement teams descended on campus.

Austin Police Chief Art Acevedo confirmed the gunman's death, and that the campus is on lockdown.