Andy Guy Nguyen was 24 when he was last seen in Mountain View, California, on July 30, 1998. He is described as Vietnamese-American, 5 feet 11 inches tall and about 130 pounds. At the time he disappeared he wore a white t-shirt with Vegas printed in blue letters, blue dress pants, black dress shoes and carried a large green backpack.

Nguyen had a diagnosed behavioral disorder; the case file does not specify the condition. Authorities classified him as endangered missing and recorded dental information and DNA in hopes of future identification. The Mountain View Police Department and other agencies continue to investigate, but few details are available about what led to his disappearance and there have been no confirmed sightings or communications since that day.

Does anyone who lived or worked in Mountain View in late July 1998 remember seeing Nguyen or his green backpack?