John Mackey's Death Renews Focus on NFL Brain Trauma

Aired: 7/7/2011 | 0:03:36 | Clip
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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