Please read Wesley Smith's commmentary on organ donation concerning the Troug and Miller article in the New England Journal of Medicine.
Smith concludes by writing:
"The authors resurrect the old false equivalence between removing life support as an action causing death and active killing--which bioethicists spent years arguing was not the case--and correctly so. When life support is removed, the death is natural. If you take someone's heart before they are dead, the person died from their heart being removed! Distinction huge, difference monumental."
Link to Wesley Smith's commentaries: