Gruetter was last seen at her home in the 31400 southeast Hamlet Drive in Boring, Oregon on September 11, 1991. She shared the house with her sister and her young son. Gruetter's sister woke up at 6:30 a.m. and discovered Gruetter was gone, her son was asleep and her car was parked in the driveway. Half an hour later, Gruetter's boss called the residence because she hadn't arrived at work. Her sister then notified the police. Gruetter has never been heard from again.

It's uncharacteristic of Gruetter to leave without warning, and she doesn't fit the profile of someone who would do so. One of her ex-boyfriends is considered a suspect in her disappearance. He has a criminal record and a history of stalking and violent behavior towards women. He hasn't faced any charged in connection to her disappearance, however.

Foul play is suspected in Gruetter's case. It remains unsolved.