manslaughter? accidental?
I read a story in the Bible where if you killed a man, it was the victim's cousin's duty to kill the murderer. It did not matter if it was accidental or not. The murderer could seek refuge in this certain city that would house him and not allow the cousin to kill the murderer. The city would then figure out if the murderer was innocent. If he was innocent, they would keep him under their hospitality, and he would work and be a citizen to the city. If he was guilty, he would be turned over to be killed.
In the olden days, if you committed a crime you were hanged. This got rid of the evil people. Now, they are let free (don't want to get into politics at all here). Once they are released, it's like an infection, and more people turn and do the crimes.
That may or not be true, that's up for debate. But if the person is truly guilty, an eye for an eye.