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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.

1:34 • Source: CNN
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What is CTE and why is it tied to the NY gunman?
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STORMI GREENER ¥ sgreener@startribune.com Sheri Eke has a prosthetic leg that allows her to walk, run, bike, hike, moto-cross and just about anything athletically that she wishes. Sheri lost her right leg in a gun shooting accident 14 years ago. She has tried numerous legs and feet, works for Attobock Distribution Co., the same company that makes the prosthetics and continues to better the product by wearing them hard. Here Sheri takes a short walk-run with some women she met up with in a local park....from left to right (from behine) Jennifer Bodine, Jodi Glaser, Lisa Salzl, Sheri (herself) and J. Pfaffinger. Sheri is preparing for her participation in the Hope & Possibility 5K, a run organized for disabled athletes, amputees in particular (Photo by STORMI GREENER/Star Tribune via Getty Images) (Photo by STORMI GREENER/Star Tribune via Getty Images)
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