Gunman who attacked Manhattan office building had CTE

NEW YORK — The gunman who killed four people in a midtown Manhattan office building in July had chronic traumatic encephalopathy, the degenerative brain disease linked to repeated head injuries sustained in football and other contact sports, according to the New York City medical examiner’s office.

The disease, known as CTE, can be diagnosed only posthumously. Shane Tamura, the gunman, killed himself after the shooting spree at 345 Park Avenue.

The medical examiner “found unambiguous diagnostic evidence of chronic traumatic encephalopathy, also known as CTE, in the brain tissue of the decedent,” according to a statement. “The findings correspond with the classification of low-stage CTE, according to current consensus criteria.”

Tamura, a former high school football player, shot himself