Upload & Sell: On
No idea what's going on with your camera other than it does look like a sticking (mechanical vs. electronic ) shutter or aperture causing the overexposure. Hard to tell from this image if the dof is consistent with the dof of your other images. If dof is significantly more shallow, then I'd be inclined to think sticking aperture vs. shutter. If dof is essentially the same, then I'd think shutter.
BTW, what shooting mode and what metering mode were you shooting in? Spot metering could have fooled your meter to overexpose significantly, especially if you had were using it in conjunction with EC. I suspect that's not the case as you were likely shooting manual exposure, but "no stone unturned" ...
Took a stab at recovery. Better to work from raw of course, but it's salvageable if there is a keeper shot worth the effort.