Donghui Zhao was 25 when he disappeared from Toronto in the autumn of 1997. The last known contact was a phone call to a friend on November 1, 1997; after that conversation he vanished from his life and was not reported missing until about three months later. At the time he was described as slender, 63 inches tall, about 110 pounds, with black hair and wearing prescription glasses.

Very few other details are available: there is no publicly reported information about where he was headed, what he was wearing that day, or his state of mind. The delay before he was reported missing and the scarcity of contemporaneous details have left the case with few leads and it remains cold. If anyone knew Donghui, his routines, or saw him around late 1997 in Toronto, please share what you remember with investigators.