What to do if someone ejaculated during the fasting of expiation for killing?

In situations while fasting of kaffaratul qital the person just could not control himself & got intimate with the wife. They did not have sexual intercourse but while the wife was fondling him, he ejaculated. What should be done now..he’s very regretful now & do not know what he should do?? He also make sincere intention that i will never repeat this??