What is the penalty for a highway robber who kills but does not take any property?

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If the highway robber kills but does not take any property, he is killed but not crucified. This is supported by the narration concerning Ibn Abbas, where the punishment mentioned for killing without taking property was only killing. This is the sounder opinion because the penalty for killing combined with taking property is more severe, implying that killing alone results in a lesser penalty (no crucifixion). The ruling regarding the mandatory nature of killing and its status as a Hadd is the same as in the case where wealth was also taken.