Is expiation (kaffara) obligatory for someone who has committed accidental killing, and whose family has reconciled with the victim's family after he has served half of his sentence?

If the iron instrument used to strike the victim is typically lethal, then this is considered intentional killing (qatl 'amd) if the strike was delivered intentionally, even if the perpetrator did not intend to kill. The offender must offer sincere repentance, perform the expiation for killing, and pay blood money (diyah) to the victim's guardians. The expiation is the freeing of a believing slave; if one cannot be found, then it is fasting for two consecutive months. The blood money is due from the killer, payable immediately from his wealth, unless the victim's guardians pardon him.