Last Respects

Horace Bollard was fishing that day but it wasn't a fish that he caught. It was a man - dead for some time. But the coroner discovers several interesting things about the body. First, he didn't die of drowning; second, the body wasn't as damaged as it should be for the amount of time in the water; and third, why was there only evidence of freshwater immersion on a body found in the tidal wash of the river?