Did Nostradamus really die standing up and if so why didn't he fall down?

I believe the story is that he was buried in an upright position, not that he remained standing when he died. <<-- In response: The legend is definitely that he died standing up. I just happened to have caught the end of a Nostradamus special on the History channel and they stated twice that he had been found standing up, and that was the reason for his original upright burial. However, other than the History channel, I cannot find any legitimate sources to back it up. I pose the same question then: Did Nostradamus really die standing up?