Overview

• New York City’s medical examiner said Shane Tamura’s brain showed “unambiguous diagnostic evidence” of low-stage chronic traumatic encephalopathy following a neuropathological examination.
• Pathologists did not attribute the mass shooting to CTE, and experts note the disease can only be definitively identified after death.
• Police recovered a three-page note in which Tamura blamed the NFL and asked that his brain be studied; investigators say he appeared to seek the league’s offices but took the wrong elevator.
• The July 28 attack killed security guard Aland Etienne, Blackstone executive Wesley LePatner, NYPD Detective Didarul Islam and Rudin Management associate Julia Hyman, and an NFL employee was seriously injured.
• The NFL offered condolences and pointed to evolving science on CTE, while investigators continue reviews of motive, firearm access and building security, including a new City Council proposal to strengthen standards for security guards.