Is blood money obligatory upon the owner of a parked car onto which a person fell from a tall building and died instantly?

In this case, the car owner is not liable for blood money (diyya) because he did not cause the person's death. His death was due to his fall from the building, meaning it was by his own action, not by the action of another. It is stated in "Kashshaf al-Qina'": "And if the second person dies by falling onto the first, then his blood is in vain (i.e., no blood money is due)."