I did this for the benefit of Peter Dawson so he may better understand what MD is about.
I wrote to Father Oscar Lukefahr on this topic as I have communicated with him on a number of issues and found him extremely helpful. I came across him through the Catholic Home Study website. If you want his biography check here:
en.wikipedia.org/wiki/Oscar_Lukefahr
Like me he feels Mary did die but confirms this is not official doctrine.
I quote his reply to me in full (and yes my real name is Jim!):
Jim,
I presume that the reason that **the Church has not made a dogmatic definition of the fact that Mary died **is that there is no reason to do so. The important thing is that Mary was assumed into heaven. Whether she died or not before being assumed into heaven really changes nothing about her eternal destiny. Having said that, I do believe that Mary died.
With regard to Mary’s assumption: As you said,
the official doctrine of the Church does not decide the issue of whether Mary died or not. Most theologians today seem to feel that she died, as her son Jesus did. Pope Pius XII, in his apostolic constitution expressing the Church’s teaching on Mary’s assumption, seems to accept the fact of Mary’s death. He quotes Saint John Damascene as an authority: “It was necessary that she (Mary) who had preserved her virginity inviolate in childbirth should also have her body kept free from all corruption after death.” Pope Pius quotes another unnamed early writer as saying that Jesus “raised her from the tomb and took her up to himself in a way he along can tell.” Finally, the pope says that Mary was preserved from the corruption of the tomb and was privileged "like her Son, when death had been conquered, to be carried up body and soul to the exalted glory of heaven, there to sit in splendor at the right hand of her Son, the immortal King of the ages.
The Church does teach as dogma that by the Assumption Mary shares bodily in the Resurrection and experiences complete union with Jesus. I understand the doctrine to mean that Jesus caused her physical body, after death, to be transformed into the spiritual body we will all have in Heaven (see 1 Cor 15:42-44), and to be glorified in the way our bodies will be glorified only at the end of time. Our physical body is subject to corruption, whereas Mary’s physical body was not subject to corruption. Why? Because Mary’s body was the “ark” which bore the body of Jesus for nine months. Because Mary was Jesus’ Mother, and as such, would have been welcomed into Heaven by her Son with all the grace and power Jesus could have shared with His beloved Mother. (Would we do any less for our own mother if we were in Jesus’ place?)
Another way of looking at the Assumption is to compare it with the phenomenon described in 1 Thess 4:16-17. Some teachers and theologians describe Mary’s Assumption in these very terms. They say that Mary has already experienced fully what we will experience fully only at the end of time.
The Assumption seems to have been taken for granted by Catholics as far back as the historical records go. While the Bible carries no description of Mary’s actual Assumption, it does describe Mary, after her Assumption, as exalted in heaven. I am referring to John’s vision in Revelation 12 of the woman “clothed with the sun, with the moon under her feet, and on her head a crown of twelve stars.” This picture of Mary provides scriptural basis for the belief given to the Church by the Holy Spirit that Mary was assumed into heaven. Scott Hahn, a former anti-Catholic minister who converted to Catholicism in 1986, notes that in the Book of Revelation only Jesus and Mary are described as having bodies now; all the other saints are described as “spirits” or “souls.”
May God bless you and Mary watch over you.
Fr Oscar Lukefahr