Youcat commented through CCC – Question n. 393.

YOUCAT Question n. 393 - How do Christians assist someone who is dying?

(Youcat answer) Christians do not leave a dying person alone. They help him so that he can die in faith-filled trust, in dignity and peace. They pray with him and take care that the sacraments are administered to him at the right time.   

A deepening through CCC

(CCC 2299) The dying should be given attention and care to help them live their last moments in dignity and peace. They will be helped by the prayer of their relatives, who must see to it that the sick receive at the proper time the sacraments that prepare them to meet the living God.     

Reflecting and meditating 

(CCC Comment)

(CCC 1525) Thus, just as the sacraments of Baptism, Confirmation, and the Eucharist form a unity called "the sacraments of Christian initiation," so too it can be said that Penance, the Anointing of the Sick and the Eucharist as viaticum constitute at the end of Christian life "the sacraments that prepare for our heavenly homeland" or the sacraments that complete the earthly pilgrimage. 

(The next question is: How do Christians treat the corpse of someone who has died?)