The pain he felt when the bullets entered his heart is nothing compared to the pain of the judgement he receives from his creator.
I truly hope he repented before he died, and from some accounts I’ve read, he seems to have done so. If he did, then he will enter heaven, just as any repentant sinner does.
In any case, this whole episode is a tragedy. For the victim, for his family, and for the murderer and his family, too. It is a further tragedy to take any joy in his execution, however necessary or justified it may be.
In 1988 a close family friend, who was like a sister to me, was carjacked and murdered. Ten years later her murderer was executed. I can tell you, the “closure” that families want and expect to experience when the murderer is executed does not come. Or if it comes, it is very transitory.
The only peace that comes is from forgiveness and a willingness to unite the suffering you continue to experience with the suffering of Christ, who was also murdered, and offer it for the redemption of all sinners, including the murderer.
What?????
In your lexicon, "judge not, lest ye be judged."
Moreover...and perhaps more to the point, are you absolutely certain that he did not ask for....and receive...forgiveness just before the shots?