Abu Najih (may Allah have mercy on him) said that in Dhu al-Qa'dah, in Makkah, a man had his mount trample a woman and killed her. Sayyiduna Uthman (may Allah be pleased with him) took from him the full diyah and an additional third.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الديات / 16134