Board Thread:Questions and Answers/@comment-5972544-20130724143413/@comment-76.29.6.185-20131220233711

My guess is that his wish was to die surrounded by family and friends, so he died when he was being tortured by the undeads. When Ai revealed that he is her father, he died and became an undead. Then he died again in the grave near Hana's and with friends and family surrounding him.