An initial autopsy on the man found dead in the Huron River Friday revealed no signs of physical trauma, police said Monday.

There was no initial sign of trauma on the body of the man found in the Huron River Friday.

Ann Arbor police Detective Lt. Robert Pfannes said Monday a toxicology screen is being done on the man, believed to be in his 40s. Police are not releasing the man’s name because his family has not been notified, Pfannes said.

“There was no sign of any physical violence or trauma,” Pfannes said. “The toxicology screen will have to help with some of that.”

Ann Arbor police and the Washtenaw County Sheriff’s Office dive team pulled the man from the river about noon Friday near the 900 block of North Main Street. A runner in the area discovered the man in the river, Pfannes said.

It’s unknown if the man might have fallen off a bridge into the river — there is a railroad trestle over the Huron River near where the man was found Friday.

The investigation into the incident continues.

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Kyle Feldscher covers cops and courts for AnnArbor.com. He can be reached at kylefeldscher@annarbor.com or you can follow him on Twitter.