What is the ruling of Islamic law concerning the killer of a woman unjustly and the one who incites her killing?

The direct killer is executed unless the one ordered to kill is a minor or insane, in which case the one who gave the order is executed. If the direct killer is executed, the instigator who ordered the killing is disciplined and admonished, but not executed. So, if the direct perpetrator and the cause (instigator) are both present, the responsibility lies with the direct perpetrator.