FILE - In this 1971 file photo, Detroit Lions football player Alex Karras poses for a photo, location not known. Now 76, and diagnosed with dementia, Karras is taking on the role of lead plaintiff: He and his wife, Susan Clark, are two of 119 people who filed suit Thursday, April 12, 2012, in U.S. District Court in Philadelphia, the latest complaint brought against the NFL by ex-players who say the league didn't do enough to protect them from head injuries. (AP Photo/File)

Associated Press
FILE - In this 1971 file photo, Detroit Lions football player Alex Karras poses for a photo, location not known. Now 76, and diagnosed with dementia, Karras is taking on the role of lead plaintiff: He and his wife, Susan Clark, are two of 119 people who filed suit Thursday, April 12, 2012, in U.S. District Court in Philadelphia, the latest complaint brought against the NFL by ex-players who say the league didn't do enough to protect them from head injuries. (AP Photo/File)
FILE - In this 1971 file photo, Detroit Lions football player Alex Karras poses for a photo, location not known. Now 76, and diagnosed with dementia, Karras is taking on the role of lead plaintiff: He and his wife, Susan Clark, are two of 119 people who filed suit Thursday, April 12, 2012, in U.S. District Court in Philadelphia, the latest complaint brought against the NFL by ex-players who say the league didn't do enough to protect them from head injuries. (AP Photo/File)
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