What is chronic traumatic encephalopathy?

Published On: May 06 2012 04:48:36 PM PDT   Updated On: Mar 17 2015 07:57:27 AM PDT

Find out more about chronic traumatic encephalopathy, the disease several former NFL pros claim they are now suffering from due to hits on the field.

John Mackey
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John Mackey, one of NFL football's great tight ends, died in 2011 of frontotemporal dementia, a syndrome similar to CTE that involves degeneration of the brain.

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