What could have been a tragic story looks to have been resolved in a peaceful manner.
The Louisville Courier-Journal reports:

A former University of Louisville student and contract employee was apprehended by University of Louisville Police Friday morning after a law library staff member recognized that he was barred from campus.
According to police, Thomas H. Irwin entered the law library at about 8:30 a.m. with two handguns and ammunition. A library employee called U of L Police, who escorted Irwin from the premises without incident.

According to an email sent to the student body, the former University of Louisville student “had been declared persona non grata by the university in December 2008.”
Way to watch over your library like a hawk, not a cardinal, unknown super-staffer. We gotta get you into the TSA.
Statement from the university, after the jump.

The statement from the university about the incident from the Cardinal Lawyer:

A former University of Louisville student and contract employee was apprehended by UofL Police this morning after carrying weapons into the Law Library.
UofL Police have arrested Thomas H. Irwin and charged him with carrying a concealed deadly weapon and with criminal trespass.
According to police, Irwin entered the law library at about 8:30 a.m. with two handguns and ammunition. After receiving a call from an employee, UofL Police arrived on the scene and escorted Irwin from the premises without incident. He was taken to ULPD headquarters for further investigation.
Irwin had been declared persona non grata by the university in December 2008.
UofL officials praised the law school employee who called the police.
“We have systems in place to protect our students, faculty and staff, and in this case the employee acted quickly and appropriately,” said Provost Shirley Willihnganz. “I also want to thank our police for acting quickly.”
The university will provide more details later today.

Former U of L student arrested for taking guns into law library [Louisville Courier-Journal]