Ibn Abi Mulaykah (may Allah have mercy on him) says: I asked Sayyiduna Abdullah bin al-Zubayr (may Allah be pleased with them both) about a man who divorced his wife irrevocably during his final illness. He said: Sayyiduna Uthman (may Allah be pleased with him) made her an heir, but I do not make her an heir, because he separated her irrevocably. [Sahih]
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الخلع والطلاق / 15125