Is it permissible for someone who is obligated to perform the expiation for accidental killing, which is fasting for two consecutive months, to fast the month of Ramadan as part of the months of expiation?

A person must fast Ramadan with the intention of fulfilling the obligatory fast. Their fasting of Ramadan does not count towards expiation. Rather, they must continue fasting the remainder of the expiation immediately after Eid al-Fitr. The fast of Ramadan and breaking the fast on Eid al-Fitr do not interrupt the required continuity of the expiation fast.