Irving

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David Rodgers of San Diego and Cheryl Kilcheski of Irving, Texas, wrote condolences to the Bush family at the George W. Bush Presidential Library and Museum.

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Dallas Cowboys offensive coordinator Bill Callahan, left, is followed by rookie guard Zack Martin (70) during a rookie minicamp at the Cowboys' headquarters Friday, May 16, 2014, in Irving, Texas. (AP Photo/Tim Sharp)

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Former Texas Rangers manager Ron Washington looks down at the podium as he makes a statement at a news conference, Thursday, Sept. 18, 2014, in Irving, Texas. (AP Photo/Tony Gutierrez)

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Dallas Cowboys practice squad player defensive end Michael Sam arrives to speak to reporters after team practice at the team's headquarters Wednesday, Sept. 3, 2014, in Irving, Texas. (AP Photo/LM Otero)

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Oklahoma State President and Chairman of the Big 12 board of directors Burns Hargis, , left, and Big 12 Commissioner Bob Bowlsby, talk at the end of the Big 12 meetings at the Four Seasons Resort and Hotel in Irving, Texas, on Friday, May 30, 2014. (AP Photo/Stephen Hawkins)

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Dallas Cowboys linebacker Sean Lee is helped off the field by head athletic trainer Jim Maurer, left, and associate athletic trainer Britt Brown, right, after suffering an unknown left leg injury during an NFL football organized team activity, Tuesday, May 27, 2014, in Irving, Texas. (AP Photo/Tony Gutierrez)

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Dallas Cowboys linebacker Sean Lee is helped off the field by head athletic trainer Jim Maurer, left rear, and associate athletic trainer Britt Brown, right, after suffering an unknown left knee injury during an NFL football organized team activity, Tuesday, May 27, 2014, in Irving, Texas. (AP Photo/Tony Gutierrez)

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Dallas Cowboys quarterback Tony Romo watches as the team runs drills during an NFL football organized team activity, Tuesday, May 27, 2014, in Irving, Texas. (AP Photo/Tony Gutierrez)

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Dallas Cowboys quarterback Tony Romo watches as Caleb Hanie throws a pass during an NFL football organized team activity, Tuesday, May 27, 2014, in Irving, Texas. (AP Photo/Tony Gutierrez)

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Dallas Cowboys quarterback Tony Romo watches as the team runs drills during an NFL football organized team activity, Tuesday, May 27, 2014, in Irving, Texas. (AP Photo/Tony Gutierrez)

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Dallas Cowboys linebacker Sean Lee is helped off the field by head athletic trainer Jim Maurer, left, and associate athletic trainer Britt Brown, right, after suffering an unknown left leg injury during an NFL football organized team activity, Tuesday, May 27, 2014, in Irving, Texas. (AP Photo/Tony Gutierrez)

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Dallas Cowboys' Sean Lee (50) is attended to by the athletic training staff after Lee suffered a injury during an NFL football organized team activity, Tuesday, May 27, 2014, in Irving, Texas. (AP Photo/Tony Gutierrez)