Most of the vandalism took place in bathroom stalls. Police say Fulk wrote UI employees are overpaid and UI graduate, Shahid Khan, should be killed. The threats started in November and police say at least 13 incidents took place through April. Employees would clean of the graffiti, but it would soon reappear.
On April 25, a UI police officer checked a stall and found a man's feet facing the wall. He thought it was strange and waited for the man to leave. Officials say the officer found graffiti and the suspect was Fulk.
"There are so many other constructive ways of expressing your opinion in this particular society anyway. I'm mostly sorry he felt angry enough to deface public property," graduate assistant Elizabeth Surbeck said.
Fulk used to work at the library. He appeared in court Tuesday charged with four counts of defacement of school property.
Copyright 2016 Nexstar Broadcasting, Inc. All rights reserved. This material may not be published, broadcast, rewritten, or redistributed.