NY gunman Shane Tamura who cited CTE was once a standout high school football player

Years before police say he gunned down four people at a Manhattan tower that is home to the National Football League, Shane Tamura was a celebrated high school football star.

​ Years before police say he gunned down four people at a Manhattan tower that is home to the National Football League, Shane Tamura was a celebrated high school football star. Read More Breaking News, Latest News and Videos | CNN