We don’t know if Mary died or not. The Church has not made a clarification on this. It is possible that she did. Our Lord was born without original sin and He certainly died. On the other hand, it is possible that Our Lady did not die. In either case, the Church DOES teach that she was taken up, body and soul to heaven.
DISCLAIMER: Catholic Answers has turned over the archive to Catholic-Questions.org and no longer owns, manages, or moderates the forums. For additional apologetics resources please visit www.catholic.com.