The shooter who killed 4 people in a New York City skyscraper allegedly targeted the NFL headquarters -- before turning the gun on himself Monday night -- and had a form of brain damage, and indicated he wanted his brain studied.
Investigators found a 3-page suicide note on 27-year-old Shane Tamura's body claiming he had CTE, our law enforcement sources say. CTE is a degenerative brain disease found in individuals with a history of repeated head impacts, according to the Mayo Clinic.