ST. CHARLES, Ill. (STMW) — An Algonquin man agreed to a plea deal of eight years in prison Thursday for stabbing and injuring his former girlfriend at a northwest suburban mall last year.

William R. Clark III, 22, of the 1400 block of Winaki Trail in Algonquin agreed with the Kane County State’s Attorney to the sentence in exchange for a guilty plea to attempted first-degree murder, a Class X felony, a release from the Kane County State’s Attorney’s office said.

At about 8:30 p.m. on April 7, 2010, Clark entered a store where his former girlfriend worked at Spring Hill Mall in West Dundee. He then forced the woman into the men’s restroom at the back of the store and locked the door.

As she had her back to him, Clark stabbed her once in the back with a 7-inch long military issue bayonet knife, the release said.

After he stabbed her, Clark then held the knife to her throat as she begged him not to kill her. He dropped the knife, walked her back to the sales floor and told her co-workers she had been stabbed.

Bystanders and co-workers detained Clark until authorities arrived and arrested him.

The woman survived the attack.

According to Illinois law, Clark must serve at least 85 percent of the sentence. He was given credit for at least 533 days served in the Kane County Jail, where has been held since his arrest on $650,000 bond. That bond was revoked upon conviction, the release said.

(Source: Sun-Times Media Wire © Chicago Sun-Times 2010. All Rights Reserved. This material may not be published, broadcast, rewritten, or redistributed.)