John Mackey's Death Renews Focus on NFL Brain Trauma
Clip: 07/07/2011 | 3m 36s
Pro Football Hall of Famer and legendary Baltimore Colts tight end, John Mackey died Wednesday, at the age of 69, after a struggle with dementia. Ray Suarez looks back on Mackey's work after his professional football career focused on the link between football and brain disease.
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