In talking recently to a friend of mine, a debate came up between her and I. She stated that Mary was assumed into heaven body and soul WITHOUT dying. I stated the reverse, that Mary died, was buried and like her Son, assumed out of the grave and into Heaven. Mary, of course not stopping to appear to the Apostales as did Christ. Well, who was right??....

FATHERS:

" he Apostles took up her body on a bier and placed it in a tomb; and they guarded it, expecting the Lord to come. And behold, again the Lord stood by them; and the holy body having been received, He commanded that it be taken in a cloud into paradise: where now, rejoined to the soul, [Mary] rejoices with the Lord's chosen ones..." Gregory of Tours, Eight Books of Miracles, 1:4 (inter A.D. 575-593).

"As the most glorious Mother of Christ, our Savior and God and the giver of life and immortality, has been endowed with life by him, she has received an eternal incorruptibility of the body together with him who has raised her up from the tomb and has taken her up to himself in a way known only to him." Modestus of Jerusalem, Encomium in dormitionnem Sanctissimae Dominae nostrae Deiparae semperque Virginis Mariae (PG 86-II,3306),(ante A.D. 634).

"It was fitting ...that the most holy-body of Mary, God-bearing body, receptacle of God, divinised, incorruptible, illuminated by divine grace and full glory ...should be entrusted to the earth for a little while and raised up to heaven in glory, with her soul pleasing to God." Theoteknos of Livias, Homily on the Assumption (ante A.D. 650).

St. Juvenal, Bishop of Jerusalem, at the Council of Chalcedon (451), made known to the Emperor Marcian and Pulcheria, who wished to possess the body of the Mother of God, that Mary died in the presence of all the Apostles, but that her tomb, when opened upon the request of St. Thomas, was found empty; wherefrom the Apostles concluded that the body was taken up to heaven." John of Damascene, PG (96:1) (A.D. 747-751).

"It was fitting that the she, who had kept her virginity intact in childbirth, should keep her own body free from all corruption even after death. It was fitting that she, who had carried the Creator as a child at her breast, should dwell in the divine tabernacles. It was fitting that the spouse, whom the Father had taken to himself, should live in the divine mansions. It was fitting that she, who had seen her Son upon the cross and who had thereby received into her heart the sword of sorrow which she had escaped when giving birth to him, should look upon him as he sits with the Father, It was fitting that God's Mother should possess what belongs to her Son, and that she should be honored by every creature as the Mother and as the handmaid of God." John of Damascene, Dormition of Mary (PG 96,741), (ante A.D. 749).

(The Dormition: ivory plaque, late 10th-early 11th century (Musée de Cluny)

"Venerable to us, O Lord, is the festivity of this day on which the holy Mother of God suffered temporal death, but still could not be kept down by the bonds of death, who has begotten Thy Son our Lord incarnate from herself." Gregorian Sacramentary, Veneranda (ante A.D. 795).

God, the King of the universe, has granted you favors that surpass nature. As he kept you virgin in childbirth, thus he kept your body incorrupt in the tomb and has glorified it by his divine act of transferring it from the tomb." Byzantine Liturgy, from Munificentis simus Deus (8th Century).

Catholic Encyclopedia

Common consent favours Jerusalem, where her tomb is shown; but some argue in favour of Ephesus. The first six centuries did not know of the tomb of Mary at Jerusalem.

Note-if she didn ot die, how could she have a tomb and why was it important to locate?

By promulgating the Bull Munificentissimus Deus, 1 November, 1950, Pope Pius XII declared infallibly that the Assumption of the Blessed Virgin Mary was a dogma of the Catholic Faith. Likewise, the Second Vatican Council taught in the Dogmatic Constitution Lumen Gentium that "the Immaculate Virgin, preserved free from all stain of original sin, was taken up body and soul into heavenly glory, when her earthly life was over, and exalted by the Lord as Queen over all things (n. 59)."]

Note- when her earthly life was over.

(Mary's Tomb is a tomb in the Kidron Valley near Jerusalem attributed to Mary, the mother of Jesus. It is located at the foot of Mount of Olives near the Church of All Nations.)

Catechism of the Catholic Church

966 "Finally the Immaculate Virgin, preserved free from all stain of original sin, when the course of her earthly life was finished, was taken up body and soul into heavenly glory, and exalted by the Lord as Queen over all things, so that she might be the more fully conformed to her Son, the Lord of lords and conqueror of sin and death." The Assumption of the Blessed Virgin is a singular participation in her Son's Resurrection and an anticipation of the resurrection of other Christians:

In giving birth you kept your virginity; in your Dormition you did not leave the world, O Mother of God, but were joined to the source of Life. You conceived the living God and, by your prayers, will deliver our souls from death.

Note-Dormition means:

The Feast of the Dormition or FallingAsleep of the Theotokos commemorates the death, resurrection, and glorification of Christ's mother(source http://www.theologic.com/oflweb/feasts/08-15.htm)