说出事前凶手联系了朋友，说是打算死了，会上新闻。朋友联系了警察局，警察局没怎么当回事。

https://www.newschannel5.com/news/she-checked-her-instagram-she-didnt-expect-a-message-from-the-covenant-school-shooter

死者之一是小学校长。

凶手有留manifesto，还没公布。

https://www.dailymail.co.uk/news/article-11909317/amp/High-school-friend-Nashville-school-shooter-says-sweet-funny-school.html