The shooter in Midtown Manhattan on Monday was the latest former #football player to choose this fate, though only after more carnage. The gunman, #ShaneTamura, shot himself in the chest after killing 4 others. The police said Tamura, who played high school football in California, carried a note that referred to chronic traumatic encephalopathy, or #CTE, the degenerative #brain disease that has been linked to repeated blows to the head in contact sports.