Question: A man worked in a non-Muslim country. He was forced not to fast during the month of Ramadaan, and he died after he returned to his country. What is the ruling on this case?
Answer: If a person dies before making up for the days of fast he missed in Ramadaan, then any of his heirs can fast on his/her behalf if they want. The Prophet (peace be upon him) is reported to have said: If anyone dies in a state (that he had to complete) some days of fasting, his heir must fast on his behalf.... read more here.