| http://www.w3.org/ns/prov#value | - Santonio Holmes, Ronnie Brown, Asante Samuel, Jonathan Vilma and Kellen Winslow Jr. are among former stars on the downside of their careers.''I could retire,'' Winslow wrote on Twitter last month, ''but he is not who I am.''here is a look at a few familiar unsigned free agents:---RONNIE BROWN: Once one of the NFL's most dynamic running backs, Brown, 32, comes off a season during which he ran for 1
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