Zimmerman was last seen on May 26, 1997. Her parents said that she took a soda from the refrigerator and departed their Gifford, Illinois residence at approximately 8:30 p.m. She is believed to have attended a party in rural Rantoul, Illinois that night. Authorities received information that she was dropped off near her family's residence at 3:00 a.m. on May 27, but it was not confirmed. Zimmerman has never been heard from again. She left all of her personal belongings at home. Her purse had been stolen prior to her disappearance and she was not carrying any credit cards, cash or identification as a result. She never collected her last paycheck from her place of employment. Authorities stated foul play has not been ruled out in Zimmerman's disappearance. Her case remains unsolved.