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Several research groups competed to study Junior Seau's brain after he died. Did the NFL help pick the winner?

Former NFL running back Leroy Hoard discusses coping with headaches, memory loss and depression and explains why he must never forget Andre Waters, Dave Duerson and Junior Seau, three former NFL players who committed suicide.

From NFL veterans, like Jacob Bell, to newcomers, like Chad Diehl, some players are choosing to walk away from football over concerns about their long-term health.

John Parrella, member of the 1994 San Diego Chargers AFC Champions team, remembers Junior Seau and the other teammates he's lost from that team.