If a customer walks into a store and pulls a toy gun on the owner as a prank

If a customer walks into a store and pulls a toy gun on the owner as a prank

If a customer walks into a store and pulls a toy gun on the owner as a prank resulting in the owner thinking it is a real gun and suffering a fatal heart attack, then is the customer morally responsible for his death? If so, what ought his punishment be? Should it be less if the owner is in his late eighties and the customer attempted CPR?

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