The Brief

NEW YORK - Police are still working to understand why a man drove cross-country with an assault rifle and opened fire inside a Midtown Manhattan high-rise; killing four people, wounding one more, and then taking his own life.

Authorities identified the gunman as 27-year-old Shane Tamura from Las Vegas, Nevada. According to New York City Police Department (NYPD) Commissioner Jessica Tisch, Tamura had a history of mental illness and acted alone.

Shane Tamura claims to suffer from CTE

In a video message, Tisch said Tamura left a suicide note and claimed to be suffering from chronic traumatic encephalopathy (CTE), possibly from playing high school football." He also blamed the NFL.

He also asked that his brain be studied for signs of the degenerative disease.

According to the

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