Who do you pray to? This is one wicked lady... you can pray to forgive trespasses against you, but if not against you, one must pray for justice.
You can forgive a debt owed to you, but not one owed to your neighbor. If your friend owes you $100 dollars, you can cancel that debt if you like; however, if your friend owes me $100, you have no such authority to cancel that debt. You can forgive a sin against you, but not a sin against your neighbor. Only God has authority to forgive a murderer and even He will not forgive the unrepentant murderer.
murderer = sinner in my last post