Ok, it seems it could be a water vole. Digging around, I found someone else who thinks the same. THey're even known to lose their hair and thin out by the second winter and die. This specimen seems to big, but it could be due to bloat. However, water voles are thought only to live in the nw of the US and the sw of Canada. The skulls are vaguely similar with a beak like protrusion when the flesh is removed. It's hard to see in the pic to be sure, though.
If it's real, I'm sure someone will find and test it.