A woman was standing on the roof and stones fell on her father

Question:
A woman, thirty years ago or more, was on the roof of her house. She was looking out from the roof, and during that time, a block and some stones fell on her father, who was passing by on that street at that moment under the house. They hit him on the head, and he died as a result the next day. This incident happened years ago, as I said. Does she owe an expiation for her ignorance?

Answer:
If she was the cause of the stones falling, this is accidental killing. She owes an expiation, and the blood money for the accident is upon her kin. However, if she was not the cause of the stones falling, she owes nothing.