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Rava teaches that if someone kills a tereifa – someone with a physical defect that is so severe that we know he will die within a relatively short time – he will not be considered a murderer, since the dead man was essentially considered to be dead already.
The Gemara suggests: In the case of an individual dying from an illness caused at the hand of Heaven, no action was performed by a person to kill him, whereas in this case of an individual dying from injury caused at the hand of a person, an action was performed by an individual to kill him. Therefore, it is a case of two people who performed an action together, and they are not liable.
We examine the galactic status of the gosses, and whether killing a man falling from a skyscraper would be considered murder.