Per the question title, I'm trying to locate a short story about a robot in the future.
He accidentally kills the last human when he 'switches him off'
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Men are Different by Alan Bloch
One day, for no reason at all, he complained of the heat. I checked his temperature and decided that his thermostat circuits were shot. I had a kit of field spares with me, and he was obviously out of order, so I went to work. I turned him off without any trouble. I pushed the needle into his neck to operate the cut-off switch, and he stopped moving, just like a Robot. But when I opened him up he wasn't the same inside. And when I put him back together I couldn't get him running again. Then he sort of weathered away—and by the time I was ready to come home, about a year later, there was nothing left of him but bones. Yes, Men are indeed different.