Hypothetical question/scenario: someone who has not been converted is murdered…

Hypothetical question/scenario: someone who has not been converted is murdered and by default goes to hell. The murderer is arrested, sent to prison and while awaiting execution comes to faith in Jesus and will now go to heaven when he dies. Is it fair that the person who effectively dispatched someone to eternal damnation ends up in heaven while his victim languishes in hell? Or is it that the victim was going to go to hell anyway so “to hell with him”? Was the sole purpose of the victim’s earthly existence to be a tool for the salvation of another? Discuss.