Vegas man storms NFL’s NYC office, sparking deadly chaos.

Four killed in seconds: guard, exec, cop, and young pro.

Wrong elevator saves NFL staff from worse fate.

Cleaner hides, prays as bullets tear through closet door.

Medical report: Gunman had CTE from high school football.

His brain trauma wasn’t from NFL, but amateur games.

Note in pocket slams NFL for hiding concussion risks.

His plea: “Study my brain, I’m sorry.” Chilling words.

NFL mourns, says CTE science still a big question mark.

Football’s brain toll needs action—lives are at stake.