On August 2, 2018, Pope Francis announced an update to the Catechism of the Catholic Church, making a prohibition on the death penalty official Catholic teaching. Prior to this change, many scholars believed that the historic teaching of the Church did not declare capital punishment intrinsically immoral, even if the practice is, as a matter of prudence, not required in countries with modern prison systems that can safely isolate dangerous criminals. Other scholars argued that the natural law duty to respect all human life does in fact render any intentional taking of human life morally unacceptable, and that this development of doctrine does not contradict any infallible teaching.
The articles below lay out this debate, with clear summaries of the arguments on both sides.
Rod Dreher comments on the Pope's announcement and quotes extensively from the writings of our friend Ed Feser.