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I believe stateside it’s called ‘manslaughter’ in a case such as that. Manslaughter is “the crime of killing a human being without malice aforethought, or otherwise in circumstances not amounting to murder.” So no, it wouldn’t be deserving of a murder sentence… Edit: Unless the jury or judge deemed it so, of course.
To make matters even more confusing it all depends on state. Most have manslaughter and for a couple it would be 3rd degree murder.