EVANSTON – Autopsy results released Friday showed a Northwestern University student found in a suburban Chicago harbor drowned, but the medical examiner could not determine whether the death was accidental.

A fisherman found the body of 18-year-old Harsha Maddula on Thursday night in Wilmette Harbor, a few miles north of Evanston, six days after he disappeared after leaving an off-campus party. U.S. Coast Guard and Wilmette firefighters recovered the body.

The Cook County Medical Examiner’s office said the manner of his death was undetermined because there was not enough information to rule it an accident, a homicide or a suicide.