MILWAUKEE --- A 24-year-old man was bound over for trial Friday for the attempted murder of his ex-girlfriend inside of M.A.T.C. on September 12th

Officials say Ruben Casarez Jr. locked the 24-year-old woman in a room and attacked her with a knife.

The woman suffered critical injuries.

Two men heard the screams, kicked down the door, and stopped the attack. They held Casarez down until campus security arrived.

Casarez is charged with attempted murder and other felonies. He could be sentenced to more than 100 years in prison if he's convicted.

Casarez entered a plea of not guilty by reason of mental disease or defect to the charges on Friday.

The victim had a restraining order in place against Casarez at the time of the stabbing. Prosecutors say Casarez has violated the restraining order several times after the attack by attempting to call the victim. The judge then revoked his telephone, visitation and U.S. Mail privileges because of the violations.

After the hearing CBS 58 News talked exclusively to Casarez' sister about the case.