Imam al-Shafi'i (may Allah have mercy on him) said: "Tulayhah killed Sayyiduna Ukkashah bin Mihsan and Sayyiduna Thabit bin Aqram (may Allah be pleased with them both), then he accepted Islam, and he was not held liable for either blood money (diyah) or retaliation (qisas)."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب قتال أهل البغي / Q16760