Musannaf Ibn Abi Shayba 18:715

Abu Bakr narrated to us, he said: Abu Bakr ibn Ayyash narrated to us, from Mughirah, from Ibrahim, who said: The blood money (diyah) is over three years. The first of it is in the year in which the injury occurs, and two-thirds are in two years. And one-third is in a year.