Jerry, was it's anus prolapsed? I've had turtles do that.... some organ or other prolapsed out of the anus.
Sometimes they do that, put it out intentionally, to "drink" water from a shallow dish, then retract it. But other times I've had them with the condition such that it seemed to be what killed them.
I have never figured out if this had to do with it or not, but when I put concrete blocks (old ones, not new ones full of uncured chemicals) into the pond for shelter for the turtles, I had two or three die in quick succession, and all with the prolapsed organ coming out the rear end. People insisted that concrete is safe in fish or turtle water, but I still feel it had to do with the deaths. I removed all concrete, and have not had it happen again.