Phung was last seen leaving her parents' Lynnwood, Washington apartment on May 9, 1991. She planned to study at Shoreline Community College and go to her clerical job at the Federal Building in downtown Seattle, Washington that day, as was her routine. She has never been heard from again. Investigators believe Phung may have been the victim of a serial killer. Few details are available in her case. Phung has a mole on the left side of her upper lip, and her ears are pierced. She may use her first, middle and last names in various different orders. Her nickname is Wiki.