Wednesday, Aug. 26 marked 17 years since a Stony Brook University student from southern China was reported missing, and the circumstances surrounding the disappearance remain unknown.

Yim Yeung “Jimmy” Tsui was 20 years old when he disappeared from his family home in New Hyde Park. Newsday reported in 2011 that Tsui’s sister looked into his room on the morning of Aug. 26, 1998 before leaving for work to find him sound asleep. She would not see her brother again.

Tsui had been taking summer classes at Stony Brook, preparing for his junior year as an undeclared major, Newsday reported. But soon after he disappeared, his family members received a letter informing them that he had been expelled from Stony Brook because he had been receiving poor grades. He disappeared 10 years after immigrating to the United States.

He stood 5-feet, 10-inches tall and weighed 140 pounds. He had black hair and brown eyes and was last seen wearing blue jeans and glasses.

Anyone with information on his disappearance or his location can call the state Missing Persons Clearinghouse at 1-800-346-3543 or submit a lead to the state Department of Criminal Justice Services website.