Wheeling Police Chief Shawn Schwertfeger said a preliminary autopsy report shows the man found near the Shilling Bridge in Elm Grove last week suffered no obvious physical trauma.
A friend found Scott Corkran, 48, of Wheeling in a creek bank under the bridge the morning of June 29.
Corkran had not been seen for about 24 hours and his family had contacted police the morning he was found dead.
The coroner who examined the body at the scene reported no signs of physical injuries such as gunshot or stab wounds, Schwertfeger said, and there is no criminal investigation at this point.
He added complete autopsy results, including a toxicology report, are not expected to be available for several weeks.
Schwertfeger did not know what Corkran may have been doing under the bridge or how his body may have gotten there, but he said investigators found nothing unusual at the scene.
The person who discovered Corkran's body was searching that area because Corkran frequently traveled there on foot.
Corkran was employed as a cook at the Market House Bar and Grill, about a mile away from where his body was found near Lumber Avenue.