Keanon Lowe, ex wide receiver for Oregon (scored first TD against OSU in title game) working as HS football and track coach, is also security guard.  Tackled  student armed with a shotgun when he came into his class.  School had been warned by other students.  Couple of links to articles

https://www.nbcnews.com/news/us-news/oregon-school-coach-keanon-lowe-for...

https://www.washingtonpost.com/sports/2019/05/18/former-university-orego...

https://247sports.com/Article/Parkrose-gunman-Keanan-Lowe-Oregon-footbal...