Did the Virgin Mary die?

While the proclamation of the Assumption does not include a dogma on this point, the Pope gives an account of the liturgical and theological tradition which teaches that the Virgin Mary, in keeping with the example of Her Son, died, was preserved incorrupt, and then raised by God from the dead.

Pius XXII, Munificentissimus Deus 20 . . . it follows that the holy Fathers and the great Doctors, in the homilies and sermons they gave the people on this feast day, did not draw their teaching from the feast itself as from a primary source, but rather they spoke of this doctrine as something already known and accepted by Christ's faithful. . . . bringing out into sharper light the fact that this feast shows, not only that the dead body of the Blessed Virgin Mary remained incorrupt, but that she gained a triumph out of death, her heavenly glorification after the example of her only begotten Son, Jesus Christ-truths that the liturgical books had frequently touched upon concisely and briefly.

The Eastern Churches, Catholic and Orthodox, refer to this event as her Dormition or falling asleep in Christ, taking the expression used for death in the New Testament.