Is a person obligated to pay diyah (blood money) or fast for two consecutive months if he accidentally hit someone with his car, leading to their death, even though he only saw them after hitting them? Also, is the amount of diyah calculated at the time of the accident or now? And to whom should it be paid if the deceased's family is unknown, and there is a fear of problems arising upon reaching out to them?

If the perpetrator did not fall short in taking the necessary precautions, then there is no blood money (diyya) due from him, nor expiation (kaffara). However, if he did fall short, then blood money and expiation are incumbent upon him. The blood money for a Christian woman is one-quarter the blood money for a Muslim man (two hundred and fifty gold dinars). This is borne entirely by the 'Aqila (male agnates responsible for blood money) if the crime is proven by evidence, and not by the perpetrator's confession. Every effort must be made to deliver the blood money to her guardians. If this is not possible, then it should be spent on charitable causes and public welfare.