Ibn Tawus (may Allah have mercy on him) narrates from his father concerning a man who died while half of him was free; he said: "It is to be divided between the two of them in halves: half for the one who freed him and half for the one who did not free him."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب العتق / 21366