Mathis on retiring: When you stomp with the big dogs, what can they say?
Indianapolis Colts: Robert Mathis won't be ready for camp - Sports Illustrated
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Veteran LB Robert Mathis to retire after 14 seasons with Colts - ABC7 Chicago
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Robert Mathis ranked one of best late-round draft picks since 2000 - Stampede Blue
Suspension, release add to Colts' concerns, Colts