tokyo japanese man arrest tuesday part dismember body find picnic cool apartment police say although media report say part many nine body may discover police make grisly find apartment zama city outside tokyo investigate disappearance 23-year-old woman early month woman see security camera footage walk man near apartment media report say police spokesman say takahiro shiraishi 27 arrest suspicion abandon body although clear whose body body part find picnic cool cover cat litter spokesman say immediately clear suspect enter plea legal representation kyodo news agency say unidentified woman post message twitter say look somebody would die police decline comment media report many body find house japanese media say least nine eight women man police arrest japanese man body part find apartment