Xiang Sun was 44 when she was last seen in Columbia, Missouri, on September 23, 2000, after returning home from her shift as a waitress. Her disappearance occurred just six days after her husband, graduate student Yinzhou Zheng, failed to arrive in Iowa on a planned September 18 visit to his daughter and was reported missing. Both spouses left their passports at home, and Yinzhou’s vehicle was later found at the couple’s residence, suggesting neither departure was plainly planned.

The University of Missouri Police Department has handled the investigation, but few public details are available and many questions remain about how two adults vanished separately over the span of a week. If anyone had contact with Xiang or Yinzhou, saw their vehicle, or remembers unusual activity around their home in September 2000, please share what is known.