Must the two months of fasting for an accidental killing expiation be consecutive, and is it necessary to restart the fasting from the beginning if one day is broken without an excuse?

Expiation for accidental killing is obligatory, and it is the freeing of a believing slave. If one is unable to do so, then it is fasting for two consecutive months. The fasting must be consecutive, and it is not permissible to break the fast except for a legitimate Sharia-compliant excuse, such as illness or menstruation. If one breaks the fast without an excuse, the fasting becomes void and must be resumed.