In my write-up today on Joseph Telushkin's A Code of Jewish Ethics, Volume 1: You Shall Be Holy, my post will be synchronic rather than diachronic, in that I'll discuss Telushkin's depiction of Judaism's stance on the issue of forgiveness without always identifying the different sources that he cites along with their times of composition.
I was somewhat confused about whether or not Telushkin believes that murder can be forgiven, according to Judaism. He cites a source saying that God ordained for David to commit adultery with Bathsheba and to kill Uriah----acts that were so uncharacteristic of David----in order to demonstrate to us God's willingness to forgive sinners (B.T. Avodah Zarah 4b-5a). That implies to me that murderers can be forgiven. At the same time, Telushkin states that murder technically cannot be forgiven, for the victim is no longer around to forgive the offender.