ولو زنى بامرأة حرة أو أمة ثم قتلها فعليه حد الزنا كاملاً
المحلى لإبن حزم
If a man commits adultery with a free woman or a slave girl, and then kills her, he has to pay the full punishment for adultery.
Sweetened [Al-muhalla] by Ibn Hazm