The New York gunman blamed CTE. I’ve seen that pain and I know silence is deadly

NYPD Crime Scene Unit officers walk outside 345 Park Avenue near the scene of a deadly mass shooting in Manhattan on Monday afternoon. Photograph: Mike Segar/Reuters

Four people lost their lives this week in a Manhattan office building, gunned down in a place I know well, by a man with a rifle and a three-page note blaming football and the brain diseases it allegedly left him with. One of the victims was an off-duty NYPD officer. Another was a Blackstone executive. All were innocent. All were just trying to make it home, and thanks to 27-year-old Shane Tamura, they never did.