A 71-year-old man was arrested Monday on suspicion of fatally assaulting his mentally impaired 44-year-old daughter at their home in Okazaki, Aichi Prefecture, police said.

They alleged that Mamoru Izumi repeatedly hit his daughter Harumi around 5 p.m. Sunday after she tore a futon. Izumi telephoned police Monday morning to say that his daughter was dead, police officials said.