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Guest
If by “actively” you mean “directly” then the answer is: Yes.Is there a substantial difference between letting someone to die … and actively killing this person?
As to direct killing.
As to allowing death:This should not cause surprise: to kill a human being, in whom the image of God is present, is a particularly serious sin (Evangelium Vitae, JPII p. 55)
[W]hen death is clearly imminent and inevitable, one can in conscience "refuse forms of treatment that would only secure a precarious and burdensome prolongation of life, so long as the normal care due to the sick person in similar cases is not interrupted. … To forego extraordinary or disproportionate means is not the equivalent of suicide or euthanasia; it rather expresses acceptance of the human condition in the face of death (Ibid p. 65).