The Chaplet of Divine Mercy is great to pray for the dying.

Our Father, who art in Heaven; hallowed by Thy name;
Thy kingdom come; Thy will be done on earth as it is in Heaven.
Give us this day our daily bread; and forgive us our trespasses
as we forgive those who trespass against us, and lead us not
into temptation; but deliver us from evil. Amen
Hail Mary, full of grace, the Lord is with you. Blessed art thou
among women and blessed is the fruit of thy womb, Jesus.
Holy Mary, mother of god, pray for us sinners now and at
the hour of our death. Amen
I believe in God, the Father Almighty, Creator of Heaven and earth;
and in Jesus Christ, his only Son, our Lord; who was conceived
by the Holy Spirit. born of the Virgin Mary,He suffered under Pontius
Pilate, was crucified, died and was buried. He descended into hell;
the third day He rose again from the dead; he ascended into Heaven
sits at the right hand of God, the Father almighty; from there he will
come to judge the living and the dead. I believe in the Holy Spirit,
the Holy Catholic Church, the Communion of Saints, the forgiveness
of sins, the resurrection of the body, and life everlasting, Amen.
Eternal Father, I offer You the Body and Blood, Soul and Divinity of
Your dearly beloved Son, Our Lord Jesus Christ, in atonement for our
sins and those of the whole world. (5 decades)
For the sake of His sorrowful Passion, have mercy on us
and on the whole world. (10 times each decade)
Holy God, Holy Mighty One, Holy Immortal One,
have mercy on us and on the whole world.
O Blood and Water that gushed forth from the Heart
of Jesus as a fountain of mercy for us, I trust in You.
Eternal God, in whom mercy is endless and the treasury
of compassion inexhaustible, look kindly upon us and
increase Your mercy in us, that in difficult moments we
might not despair nor become despondent, but with
great confidence submit ourselves to Your holy will,
which is Love and Mercy itself. Amen
