The gunman who killed four people at the New York headquarters of the NFL had low-stage CTE, a medical examiner said in a statement.

Shane Tamura killed four while targeting NFL offices in July

Shane Tamura showed evidence of early-stage degenerative brain disease tied to repeated blows to the head, according to New York City’s chief medical examiner.

The gunman who killed four people at the New York headquarters of the NFL had low-stage CTE, a medical examiner said in a statement.

The gunman who killed fourin New York City had a generative brain disease linked to repeated head injuries playing sports, medical examiner's office said.

Officials say the 27-year-old shooter intended to target NFL employees but took the wrong elevator.