Tell you the truth, a consolation of the long time between sentencing and death is (I wonder) God’s way of giving them time to repent and then face Him with a pure heart.
God is good and not willing that any should perish so I imagine so!
It is their last chance, one which they denied their victims. Jesus died to free us all from sin in general, not just from sins humans approve of for forgiveness. Vengeance is His and so is grace and mercy.
Prayers for all the victims’ loved ones. May they have peace knowing he can never hurt anyone ever again.