Autopsy results on Yongsheng Li’s body did not indicate a cause of death, University Police Chief Jimmy Williamson said.

Li, a 29-year-old doctoral student, was missing for two weeks before his body was found in a retention pond Sunday afternoon between the Women’s Sports Complex and the State Botanical Gardens on South Milledge Avenue.

His body was discovered by an elderly couple walking their dog.

Detectives at the Georgia Bureau of Investigation’s State Crime Lab performed the autopsy Monday afternoon.

They now are working on a toxicology report to determine whether drugs or alcohol played a part in Li’s death. The report is expected to be available within four to six weeks.

In the meantime, University Police are continuing to investigate the incident, Williamson said.

“We still want to talk to the couple who found his body, and we are still conducting other interviews,” he said.

No foul play is suspected at this time, Williamson said.

Li was last seen alive at 4 p.m. March 10 leaving his residence in the University’s family housing on Rogers Road.

His wife reported his disappearance to University Police at 9:21 p.m. on March 11.

During the initial report, Li’s wife gave police a note Li had written in his native language. Police declined to comment on the note’s contents.

Police have asked the couple who found Li or any one who has any information about his death to call (706) 542-2200.