https://www.mlive.com/news/2023/02/msu-shooter-anthony-mcrae-had-two-guns-10-magazines-and-a-note-that-might-reveal-a-motive.html

Michigan State shooter did indicate that there was he had a group of 20 (people) that were going to help him do what he intended to do

He left a 2 page hand-written note in his wallet

Appears to be no connection at all to MSU