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IRVING, Texas Dallas Cowboys owner Jerry Jones promised changes last week, and on Tuesday he made a big one.

Jones fired defensive coordinator Rob Ryan, ending a two-year stay on the Dallas sidelines.

Ryan's defense was ranked 14th in total yards allowed last year and dropped to 19th this season after his unit was riddled with injuries.

The Cowboys had 38 games missed by defensive starters during the season, a huge number that the defense simply could not overcome.

Under Ryan's colorful leadership, the Cowboys gave up the ninth-most points in the league this season, averaging 25 points per game.

Dallas was his fourth NFL coaching position. Ryan served as defensive coordinator in Cleveland in 2009-10 and in Oakland from 2004-08.

Before that, he was the linebackers coach in New England from 2000-03.

Ryan's tenure in Dallas lasted from 2011-12.

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