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Sammy William Walker ( born January 20 , 1969 in McKinney , Texas ) is a former professional American football cornerback in the National Football League .
 Sammy, Walker, McKinney , Texas, National Football League
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Sammy, Walker, McKinney , Texas, National Football League