The current Catechism confirms within CCC 2260:
“For your lifeblood I will surely require a reckoning… Whoever sheds the blood of man, by man shall his blood be shed; for God made man in his own image.”
“This teaching remains necessary for all time.”
Necessary for all time. Yet, the Church is trying to make the sanction all but extinct,
Quaker biblical scholar Dr. Gervas A. Carey confirms:
" . . . the decree of Genesis 9:5-6 is equally enduring and cannot be separated from the other pledges and instructions of its immediate context, Genesis 8:20-9:17; . . . that is true unless specific Biblical authority can be cited for the deletion, of which there appears to be none. It seems strange that any opponents of capital punishment who professes to recognize the authority of the Bible either overlook or disregard the divine decree in this covenant with Noah; . . . capital punishment should be recognized . . . as the divinely instituted penalty for murder; The basis of this decree . . . is as enduring as God; . . . murder not only deprives a man of a portion of his earthly life . . . it is a further sin against him as a creature made in the image of God and against God Himself whose image the murderer does not respect." (p. 111-113). Prof. Carey agrees with Saints Augustine and Aquinas, that executions represent mercy to the wrongdoer: “. . . a secondary measure of the love of God may be said to appear. For capital punishment provides the murderer with incentive to repentance which the ordinary man does not have, that is a definite date on which he is to meet his God. It is as if God thus providentially granted him a special inducement to repentance out of consideration of the enormity of his crime . . . the law grants to the condemned an opportunity which he did not grant to his victim, the opportunity to prepare to meet his God. Even divine justice here may be said to be tempered with mercy.” (p. 116).“A Bible Study”, Essays on the Death Penalty, T. Robert Ingram, ed., St. Thomas Press, Houston, 1963, 1992.
Jesus: Now one of the criminals hanging there reviled Jesus, saying, “Are you not the Messiah? Save yourself and us.” The other, however, rebuking him, said in reply, “Have you no fear of God, for you are subject to the same condemnation? And indeed, we have been condemned justly, for the sentence we received corresponds to our crimes, but this man has done nothing criminal.” Then he said, “Jesus, remember me when you come into your kingdom.” (Jesus) replied to him, “Amen, I say to you, today you will be with me in Paradise.” Luke 23: 39-43
It is not the nature of our deaths, but the state of salvation at the time of death which is most important.
Jesus: “You have heard the ancients were told, ˜YOU SHALL NOT COMMIT MURDER” and “Whoever commits murder shall be liable to the court”. But I say to you that everyone who is angry with his brother shall be guilty before the court; and whoever shall say to his brother, “Raca”, shall be guilty before the supreme court and whoever shall say, “You fool”, shall be guilty enough to go into fiery hell.” Matthew 5:17-22.
Fiery hell is a considerable more severe sanction than any earthly death.
The Holy Spirit, God, through the power and justice of the Holy Spirit, executed both Ananias and his wife, Saphira. Their crime? Lying to the Holy Spirit – to God – through Peter. Acts 5:1-11.
No trial, no appeals, just death on the spot.
God: “You shall not accept indemnity in place of the life of a murderer who deserves the death penalty; he must be put to death.” Numbers 35:31 (NAB) full context
usccb.org/nab/bible/numbers/numbers35.htm
For murder, there is no mitigation from a death sentence.