Nguyet Thu Phung, known as Wiki and often called Thu, was 19 when she vanished from Lynnwood, Washington on May 9, 1991. She left her family’s apartment that morning intending to follow her usual routine: study at Shoreline Community College and then go to her clerical job at the Federal Building in downtown Seattle. She never arrived at work and was never seen again.

Born September 18, 1971 in Vietnam, she and her family immigrated to the United States around 1975 and settled in Snohomish County. At the time of her disappearance she was described as 5 feet 2 inches, about 115 pounds, with black hair, brown eyes, a mole on the left side of her upper lip, pierced ears, and possibly wearing a gold ring on her right hand. Her employer alerted her mother when she failed to show up, which was out of character for someone who routinely kept family informed.

Investigators have had few leads; the case is cold but remains open. Authorities have noted the possibility she could be linked to a regional serial killer active then, though no suspect has been publicly named. Did anyone in the Shoreline, Lynnwood, or downtown Seattle area recall seeing Thu on May 9, 1991?