Gunman in NFL HQ building shooting diagnosed with CTE - ESPN

Shane Tamura, the man who killed four people and then himself in a July shooting at the NFL headquarters building, was posthumously diagnosed with chronic traumatic encephalopathy, according to a statement from the New York City Officer of the Chief Medical Examiner.

Tamura, 27, had claimed in a note found in his wallet following the shooting that he believed he had CTE and wanted his brain tested for it after his death. The medical examiner's office finding determined «unambiguous evidence» of CTE in Tamura's brain tissue. The testing determined Tamura suffered from «low-stage CTE.» CTE can only officially be diagnosed after death.

«We continue to grieve the senseless loss of lives, and our hearts remain with the victims' families and our dedicated employees,» the NFL said in a statement. «There is no justification for the horrific acts that took place. As the medical examiner notes, 'the science around this condition continues to evolve, and the physical and mental manifestations of CTE remain under study'.»

Tamura entered 345 Park Avenue around 6:30 p.m. on July 28 and killed four people: Didarul Islam, an off-duty police officer; Wesley LePatner, a real estate executive at Blackstone; Julia Hyman, an associate at Rudin Management and Aland Etienne, a security officer. He also wounded an NFL employee and according to law enforcement was believed to be attempting to reach NFL headquarters but took the wrong elevator.

In August, a source close to Tamura's family told ESPN that Tamura began playing tackle football at age 6 and continued through high school in the Los Angeles area before moving to Nevada, where he worked in private security and then in surveillance at a Las Vegas casino.

The source also told ESPN that