On November 14, 2019, 16 year old Nathaniel Berhow opened fire with a .45 caliber handgun, killing two fellow students and injuring 3 more.  Berhow then shot himself in the head, and was last reported to be brain dead, with no chance of recovery.  Who is Nathaniel Berhow, what could have caused the teen to open fire on his fellow students on his birthday, and what could have been done to stop this?

https://www.cbsnews.com/news/california-school-shooting-saugus-high-school-suspect-what-we-know/