>>14
警察が発表を差し控えているかららしい
理由は知らん

Police said a motive was not yet known and the couple’s names were being withheld.
https://www.japantimes.co.jp/news/2019/03/20/national/crime-legal/u-s-man-arrested-stabbing-death-japanese-wife-lobby-tokyo-court-building/#.XJIgz-SP6Hs