The mother of one of Atchison’s victims sued the FBI for not preventing the attack. The FBI had investigated Atchison in 2016 following a post of his inquiring about “where to find cheap rifles for a mass shooting.”

This document contains a selection of forum posts, comments, and journal entries believed to have been written by William Atchison, ordered chronologically and annotated. (Special thanks to Aysha Lonich, M.Ed.)