Tamura, who played high school football in California nearly two decades ago but never in the NFL, had a history of mental illness, police said. A three-page note found in his wallet suggested he had a grievance against the NFL over a claim that he suffered from chronic traumatic encephalopathy (CTE).

I really enjoy (American) football, but the brain damage from the way its played is an existential threat to the game. I’ve heard from a lot of parents that they would never let their children play it.