The legendary Texas high school football coach who put "Friday Night Lights" into the national lexicon faces his biggest challenge yet. 

Gary Gaines, 68, was recently diagnosed with Alzheimer's. The Amarillo Globe-News reports the disease is in its early stages, and Gaines is not yet showing major symptoms. His family tells KFDA, "Gary is staying positive. 

There are very small noticeable changes. He is still traveling and working. He is doing well." Gaines and his family are helping organize a charity football game next month that hopes to raise $70,000 for Alzheimer's awareness.

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