Junior Seau Junior Seau

The brain of former NFL star Junior Seau, who committed suicide last year, showed signs of the kind of neurodegenerative disease associated with repetitive head trauma. Elsa/Getty Images hide caption

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Elsa/Getty Images

Junior Seau, seen here playing for the New England Patriots toward the end of his career, suffered from a degenerative brain disease, scientists say. Otto Greule Jr./Getty Images hide caption

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Otto Greule Jr./Getty Images

Junior Seau, seen here playing for the New England Patriots toward the end of his career, suffered from a degenerative brain disease, scientists say. Otto Greule Jr./Getty Images hide caption

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Otto Greule Jr./Getty Images

Junior Seau in 2002, when he was with the San Diego Chargers. Stephen Dunn/Getty Images hide caption

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Stephen Dunn/Getty Images

Tom Goldman talks with David Greene

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