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What is CTE and why is it tied to the NY gunman?

CTE, or chronic traumatic encephalopathy, is in the news after sources say the Midtown Manhattan gunman cited the brain disease in a suicide note. CNN's Dr. Sanjay Gupta addresses some of the questions you may have.

01:34 - Source: CNN
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What is CTE and why is it tied to the NY gunman?
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