What is the ruling on money spent on Hajj on behalf of the deceased, and must it be returned to an heir who appeared after the Hajj?

Whoever was obligated to perform Hajj, possessing wealth exceeding his expenses and the expenses of his dependents, sufficient for Hajj, but did not perform it and then died, the cost of Hajj must be disbursed from his estate. This is because Hajj is a debt owed to Allah, and the debt owed to Allah has a greater right to be fulfilled. As for someone who did not possess the means for Hajj during his lifetime, Hajj is not obligatory on his behalf, unless someone volunteers to perform it.