It is narrated from Sayyiduna Awf bin Malik and Sayyiduna Khalid bin al-Walid (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) ruled concerning the salab (the slain man's gear) that "it belongs to the killer," and did not take the khumus (one-fifth) from it.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب قسم الفيء والغنيمة / 12782